novel coronavirus infection
TRANSCRIPT
8/12/2019 Novel Coronavirus Infection
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يحرلا نحرلا ب ا
وعى
د
ديس
عى
والم
والة
سو هصو هل
8/12/2019 Novel Coronavirus Infection
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Dr.AL ANOUD ABDULLAH AL-JIFRI
Chairman of Infection & Prevention Department
Infectious Diseases ConsultantKFH, Madinah , MOH
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What is coronavirus.
Diseases of coronavirus.
Mode of transmission.
Clinical presentation.
IPC strategies.
Management.
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CDC continues to work closely with the WHO and other partnersto better understand the public health risk presented by recently
reported cases of infection with a novel coronavirus (nCoV).
As of May 16, 2013, 40 laboratory-confirmed cases have been
reported to WHO :
30 from Saudi Arabia,
2 from Qatar,
2 from Jordan,
3 from the United Kingdom,
one from the United Arab Emirates,
and 2 from France.
Among the 40 cases, 20 were fatal.
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Baltimore classification is a classification system that places viruses into one of
seven groups depending on a combination of their nucleicacid (DNA or RNA), strandedness (single-stranded or
double-stranded), Sense, and method of replication.
Named after David Baltimore, a Nobel Prize-winning biologist
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Virus Family Examples (common names)
AdenoviridaeAdenovirus, Infectious canine hepatitis
virus
Papovaviridae Papillomavirus, Polyomaviridae,
Parvoviridae Parvovirus B19, Canine parvovirus
Herpesviridae
Herpes simplex virus, varicella-zoster
virus, cytomegalovirus, Epstein-Barr
virus
Poxviridae
Smallpox virus, cow pox virus, sheep pox
virus, orf virus, monkey pox virus,
vaccinia virus
Hepadnaviridae Hepatitis B virus
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Virus Family Examples (common names)
Reoviridae Reovirus, Rotavirus
Picornaviridae
Enterovirus, Rhinovirus, Hepatovirus,
Cardiovirus, Aphthovirus, Poliovirus,
Parechovirus, Erbovirus, Kobuvirus, Teschovirus,
Coxsackie
Caliciviridae Norwalk virus
Togaviridae Rubella virus, alphavirus
Arenaviridae Lymphocytic choriomeningitis virus
FlaviviridaeDengue virus, Hepatitis C virus, Yellow fever
virus
OrthomyxoviridaeInfluenzavirus A, Influenzavirus B,
Influenzavirus C, Isavirus, Thogotovirus
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Virus Family Examples (common names)
Paramyxoviridae
Measles virus, Mumps virus, Respiratory
syncytial virus, Rinderpest virus, Canine
distemper virus
Bunyaviridae California encephalitis virus, Hantavirus
Rhabdoviridae Rabies virus
Filoviridae Ebola virus, Marburg virus
Coronaviridae Corona virusAstroviridae Astrovirus
Bornaviridae Borna disease virus
Arteriviridae Arterivirus, Equine Arteritis Virus
Hepeviridae Hepatitis E virus
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Are species in the genera of virus belonging to the
subfamily Coronavirinae in the family
Coronaviridae.
The name "coronavirus" is derived from the Latin
corona, meaning crown or halo, and refers to the
characteristic appearance of virions under electron
microscopy (E.M.) with a fringe of large, bulbous
surface projections creating an image
reminiscent of the solar corona.
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Human coronaviruses were first identified
in the mid 1960s.
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Coronaviruses primarily infect the upper
respiratory and gastrointestinal tract of
mammals and birds. In chickens, the Infectious bronchitis virus (IBV), a
coronavirus, targets not only the respiratory tract
but also the uro-genital tract.
The virus can spread to different organs throughout
the chicken.
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4-5 different currently known strains of coronaviruses
infect humans.
The most publicized human coronavirus, SARS-CoV
which causes SARS, has a unique pathogenesis because it
causes both upper and lower respiratory tract infections
and can also cause gastroenteritis.
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The five coronaviruses that can infect people are:
alpha coronaviruses 229E and NL63
beta coronaviruses OC43, HKU1,SARS-CoV (thecoronavirus that causes severe acute respiratory
syndrome).
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Genus: Alphacoronavirus; type species: Alphacoronavirus 1
Species: Alpaca coronavirus, Alphacoronavirus 1, Human coronavirus
229E , Human Coronavirus NL63, Miniopterus Bat coronavirus 1,Miniopterus Bat coronavirus HKU8, Porcine epidemic diarrhea virus,
Rhinolophus Bat coronavirus HKU2, Scotophilus Bat coronavirus 512 Genus Betacoronavirus; type species: Murine coronavirus
Species: Betacoronavirus 1, Human coronavirus HKU1, Murine
coronavirus, Pipistrellus Bat coronavirus HKU5, Rousettus Bat
coronavirus HKU9, Severe acute respiratory syndrome-related
coronavirus, Tylonycteris Bat coronavirus HKU4, hCoV-EMC Genus Deltacoronavirus; type species: Bulbul coronavirus HKU11
Species: Bulbul coronavirus HKU11, Munia coronavirus HKU13, Thrush
coronavirus HKU12 Genus Gammacoronavirus; type species: Avian coronavirus
Species: Avian coronavirus, Beluga whale coronavirus SW1
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Coronaviruses cause colds in humans primarily in
the winter and early spring seasons.
In the United States, people usually get infectedwith human coronaviruses in the fall and winter .
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Most people will get infected with human
coronaviruses in their life time.
Young children are most likely to get
infected.
However, anybody can have multiple
infections in life time , and typically lead to
the common cold in adults and children.
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What is the new human coronavirus?
The new virus strain is the human beta-coronavirus
EMC (HCoV-EMC)
It is different from other coronaviruses that have
been found in people before.
This particular novel coronavirus is rare but causes
serious illness, including death.
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The virus may have
originated in an animal,
such as bats, but thatinvestigation is still
ongoing.
CDC is still learning
about this new virus.
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This novel coronavirus is from the same large
family of viruses that includes the SARS virus.
Both viruses are capable of causing severe disease. However, one of the key differences between the
two is that this novel coronavirus doesn’t seem
to get passed from person to person easily, whilethe SARS virus did.
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SARS CORONAVIRUS
NCOV
Group: Group IV ((+)ssRNA)
Order: Nidovirales
Family: Coronaviridae
Genus: Coronavirus
Species: SARS coronavirus
Group: Group IV ((+)ssRNA)
Order: Nidovirales
Family: Coronaviridae
Subfamily: Coronavirinae
Genera
• Alphacoronavirus •Betacoronavirus •Deltacoronavirus
•Gammacoronavirus
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• The ways that human coronaviruses spread have
not been studied very much, except for SARS.
• However, it is likely that human coronaviruses
spread from an infected person to others through:
The air by coughing and sneezing
Close personal contact, such as touching or
shaking hands.
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These viruses may also spread by touching
contaminated objects or surfaces then
touching mouth, nose, or eyes.
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• Human coronaviruses usually cause mild
to moderate upper-respiratory tract
illnesses of short duration.
• Symptoms may include runny nose,
cough, sore throat, and fever.
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• These viruses can sometimes
cause lower-respiratory tract
illnesses, such as pneumonia.
• This is more common in peoplewith cardiopulmonary disease
or compromised immune
systems, or the elderly. • (Sudden ,severe, acute
respiratory illness )
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Pneumonia has been the most common
clinical presentation.
5 patients developed Acute Respiratory
Distress Syndrome (ARDS).
Renal failure, pericarditis and disseminated
intravascular coagulation (DIC) have also
occurred.
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clinical syndromes include :
Severe pneumonia
Acute Respiratory Distress Syndrome
Sepsis
Severe sepsis
Septic shock
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Probable Case
• A person fitting the definition above of a “Patient Under Investigation”,
with clinical, radiological, or histopathological evidence of pulmonary
parenchymal disease (e.g. pneumonia or the Acute Respiratory Distress
Syndrome, ARDS) but no possibility of laboratory confirmation either
because the patient or samples are not available or no testing is available
for other respiratory infections;
AND
• Close contact with a laboratory-confirmed case;AND
• Not already explained by any other infection or aetiology, including all
clinically indicated tests for community-acquired pneumonia according to
local management guidelines.
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Confirmed Case
• A person with laboratory confirmation of infection
with the novel coronavirus.
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Close contact includes:
Anyone who provided care for the patient,
including a health care worker or family member,
or who had other similarly close physical contact.
Anyone who stayed at the same place (e.g. lived
with, visited) as a probable or confirmed case
while the case was symptomatic.
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In general, SARS begins with high fever (temperature
>100.4°F [>38.0°C]).
other symptoms may include :headache, an overall feeling
of discomfort ,and body aches.
Some people also have mild respiratory symptoms at the
onset.
About 10-20% of patients have diarreah.
After 2-7 days SARS patient may develop a dry cough.
Most patients develope pnemonia.
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Preventing or limiting infection transmission in
health-care settings requires the application of
procedures and protocols referred to as “controls”. Include the following:
A. Administrative controls.
B. Environmental and engineering controls.
C. Personal protective equipment (PPE).
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These are the first priority of IPC strategies.
They provide the infrastructure of policies and
procedures to prevent, detect, and control infectionsduring health care.
To be effective, IPC measures must anticipate
the flow of patients from the first point ofencounter until discharge from the facility.
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Includes:
1) Establishment of sustainable IPC
infrastructures and activities.
2) Education of HCWs.
3) Prevention of overcrowding in waiting
areas, providing dedicated waiting areas for
the ill and placement of hospitalized
patients.
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8) Rapid identification of patients with
ARI and patients suspected of nCoV
infection, with prompt application of
appropriate precautions, and
implementation of source control.▪ Clinical triage should be used for early
identification of all patients with ARIs.
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Identified ARI patients should be placed in an area
separate from other patients, and additional IPC
precautions has to be promptly implemented. Clinical and epidemiological aspects of the cases
should be evaluated as soon as possible.
The investigation should be complemented bylaboratory evaluation.
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These include :
basic health-care facility infrastructures.
1. Ensuring adequate environmental ventilation in all
areas within a health-care facility
2. Adequate environmental cleaning.
Spatial (locative) separation of at least 1 m should be
maintained between each ARI patient and others,
including HCWs (when not using PPE).
Both controls can help reduce the spread of some
pathogens during health care
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Consistent use of available PPE and
appropriate hand hygiene help reduce the
spread of infection.
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1 . Standard Precautions:
A cornerstone for providing safe health care and
reducing the risk of further infection.
Most transmissions occur in the absence of basic IPC
precautions and before a specific infection is suspected or
confirmed; hence, the routine application of measures to
prevent spread of acute respiratory infections (ARI) when
caring for symptomatic patients is essential to reduce
spread of any ARI in health-care settings.
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Include :
Hand hygiene.
Use of PPE to avoid direct contact with patients’
blood, body fluids, secretions (including respiratory
secretions) and non-intact skin.
PPE should include the use of:
• facial protection by means of either a medical mask
and eye-visor or goggles, or a face shield;
&
• a gown and clean gloves.
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Cleaning and
disinfection of the
environment (due to the
detection of SARS CoV
RNA by PCR on
surfaces in rooms
occupied by SARS
patients).
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Prevention of needle-stick or sharps injury.
Safe waste management.
Cleaning, disinfection and, where applicable,
sterilization of patient-care equipment and
linen.
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There are
currently no
vaccinesavailable to
protect you
against humancoronavirus
infection.
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All individuals, including visitors and HCWs, in
contact with patients with ARI should:
1. Perform hand hygiene before and after contact withthe patient and his or her surroundings and
immediately after removal of a medical mask.
2. Wear a medical mask when in close contact (i.e.
within approximately 1 m) and upon entering the
room or cubicle of the patient. (Droplet precautions)
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3. Wear eye protection (i.e. goggles or a face
shield)
4. Wear a clean, non-sterile, long-sleeved
gown; and gloves (some procedures may
require sterile gloves)
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If any HCW have an illness caused by?
human coronaviruses, he/she can help
protect others by:
Staying home while they are sick.
Avoiding close contact with others.
Covering mouth and nose when coughing or
sneezing.
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Limit the number of HCWs, family
members and visitors in contact with a
patient with probable or confirmed nCoV
infection. Family members and visitors in contact
with a patient should be limited to those
essential for patient support and should be
trained on the risk of transmission and on
the use of the same infection control
precautions as HCWs who are providing
routine care.
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All individuals, including visitors and HCWs hasto:
1. Perform hand hygiene before and after contact
with the patient and his or her surroundings andimmediately after removal of PPE.
2. Wear a medical mask .
3. Wear eye protection (i.e. goggles or a face
shield).4. Wear a clean, non-sterile, long-sleeved gown;
and gloves (some procedures may require sterile
gloves).
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Use either disposable equipment or dedicated
equipment (e.g. stethoscopes, blood pressure cuffs
and thermometers).If equipment needs to be shared among patients,
clean and disinfect it between each patient use.
HCWs should refrain from touching their eyes,nose or mouth with potentially contaminated
gloved or ungloved hands.
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Place patients with probable or confirmed nCoV infectionin adequately ventilated single rooms or Airborne
Precaution rooms.
if possible, situate the rooms used for isolation (i.e.
single rooms) in an area that is clearly segregated from
other patient-care areas.
When single rooms are not available, put patients with the
same diagnosis together.
If this is not possible, place patient beds at least 1 m
a art.
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For patients with probable or confirmed nCoV infection:
a) Avoid the movement and transport of patients out of the
isolation room or area unless medically necessary.
b) Use designated portable X-ray equipment and other
important diagnostic equipment.
c) If transport is required, use routes of transport that minimize
exposures of staff, other patients and visitors.
d) Notify the receiving area of the patient's diagnosis and
necessary precautions as soon as possible before the patient’s
arrival.
!!!!!!!
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aerosol-generating procedures are
Any medical procedure (tracheal intubation ,
tracheotomy, non-invasive ventilation and manualventilation,bronchoscopy) that can induce the
production of aerosols of various sizes, including
small (< 5 mkm) particles.
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f) Has to done in a negative pressure room
g) Perform procedures in an adequately ventilated room; i.e.
minimum of 6 to 12 air changes per hour in facilities
with a mechanically ventilated room and at least 60
liters/second/patient in facilities with natural ventilation
h)limit the number of persons present in the room to theabsolute minimum required for the patient’s care and
support
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The duration of infectivity for nCoV infection is
unknown.
Isolation precautions should be used during theduration of symptomatic illness and continued for
24 hours after the resolution of symptoms.
Patient information (e.g. age, immune status andmedication) should also be considered in situations
where there is concern that a patient may be
shedding the virus for a prolonged period.
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All specimens should be regarded as
potentially infectious
HCWs who collect or transport clinical specimens
should adhere rigorously to Standard Precautions to
minimize the possibility of exposure to pathogens.
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1. Wear appropriate PPE
2. Trained in safe handling practices and spill
decontamination procedures.
3. Place specimens for transport in leak-proof specimen bags(secondary container) that have a separate sealable pocket for
the specimen (i.e. a plastic biohazard specimen bag), with the
patient’s label on the specimen container (primary container),and a clearly written request form.
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4. Ensure that health-care facility laboratories adhere toappropriate biosafety practices and transport requirements.
5. Deliver all specimens by hand whenever possible.
6. Do not use pneumatic-tube systems
to transport specimens.
7. State the name of the (suspected) ARI of potential
concern clearly on the accompanying request form.
Notify the laboratory as soon as possible that the
specimen is being transported.
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• Laboratory tests can be done to confirm infectionsecondary to human coronaviruses.
• Specific laboratory tests may include:
a) Virus isolation in cell culture.
b) Polymerase chain reaction (PCR) assays that are
more practical and available commercially.
c) Serological testing for antibodies to human
coronaviruses.• Nose and throat swabs are the best specimens for detecting
common human coronaviruses.
• Serological testing requires collection of blood specimens.
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Specimen Type and Priority
• To increase the likelihood of detecting infection,
it is recommended to collect multiple specimensfrom different sites at different times after
symptom onset, if possible.
• As of November 27, 2012, consider lower
respiratory tract and stool specimens a priority
for collection and testing.
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• For short periods (≤ 72 hours), most specimens should be
held at 2-8oC rather than frozen
• For delays exceeding 72 hrs, freeze specimens at -70oC
as soon as possible after collection (with exceptions noted
below).
• Label each specimen container with the patient’s ID
number, specimen type and the date the sample was
collected.
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A.
Lower respiratory tract: • Broncheoalveolar lavage, tracheal aspirate, pleural fluid
• Collect 2-3 mL into a sterile, leak-proof, screw-cap sputum collection
cup or sterile dry container.
• Refrigerate specimen at 2-8oC up to 72 hrs; if exceeding 72 hrs, freezeat -70oC and ship on dry ice.
• Sputum
• Have the patient rinse the mouth with water and then expectorate
deep cough sputum directly into a sterile, leak-proof, screw-capsputum collection cup or sterile dry container.
• Refrigerate specimen at 2-8oC up to 72 hrs; if exceeding 72 hrs, freeze
at -70oC and ship on dry ice.
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Nasal Aspirates
Collect 2-3 mL into a sterile, leak-proof, screw-cap
sputum collection cup or sterile dry container.
Refrigerate specimen at 2-8oC up to 72 hrs; if exceeding
72 hrs, freeze at -70oC and ship on dry ice.
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Serum
• For eventual serum antibody testing: Serum specimens should be collected
during the acute stage of the disease, preferably during the first week after
onset of illness, and again during convalescence, ≥ 3 weeks later.•
Children and adults
• Collect 1 tube (5-10 mL) of whole blood in a serum separator tube. Allow the
blood to clot, centrifuge briefly, and separate sera into sterile tube container.
The minimum amount of serum required for testing is 200 μL. Refrigeratespecimen at 2-8oC and ship on ice- pack; freezing and shipment on dry ice is
permissible.• Infants
• A minimum of 1 cc of whole blood is needed for testing of pediatric patients.
If possible, collect 1 cc in an EDTA tube and in a serum separator tube. If only
1cc can be obtained, use a serum separator tube.
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EDTA blood (plasma)
Collect 1 tube (10 mL) of heparinized (green-top) or
EDTA (purple-top) blood.
Refrigerate specimen at 2-8oC and ship on ice-pack; do
not freeze.
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Collect 2-5 grams of stool specimen (formed
or liquid) in sterile, leak-proof, screw-cap
sputum collection cup or sterile dry container. Refrigerate specimen at 2-8oC up to 72 hrs; if
exceeding 72 hrs, freeze at -70oC and ship on
dry ice.
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Respiratory
Specimens
Test for other
respiratory pathogens
If POSITIVE for other
respiratory pathogens:
1.Testing for novel CoVmay not be required
2.Contact CDC for
consultation
If NEGATIVE for other respiratory
pathogens:
1.Prepare multiple sample aliquots
(≥200 μL) for retention at -70°C andshipping to CDC
2.Notify your local/state health
department and CDC
3.Contact CDC for approval to send
specimen aliquot for novel CoV
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• Respiratory pathogens to be considered for testing by molecular
or antigen detection methods (not by viral culture) include:
• 1) influenza A, influenza B, respiratory syncytial virus,
human metapneumovirus, human parainfluenza viruses,
adenovirus, human rhinovirus and other respiratory viruses.
• 2) Streptococcus pneumoniae, Legionella pneumophila, and
other pathogens that cause severe lower respiratory infections.
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Routine confirmation of cases of novel
coronavirus infection will be based on
detection of unique sequences of viral RNAby real-time reverse-transcriptase
polymerase chain reaction (RT-PCR) and
sequencing.
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To consider a case as laboratory-confirmed, one of
the following conditions must be met:
Positive PCR assays for at least two differentspecific targets on the novel coronavirus genome
OR
One positive PCR assay for a specific target onthe novel coronavirus genome and an additional
different PCR product sequenced, confirming
identity to known sequences of the new virus
INTERPRETATION OF LABORATORY RESULTS
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A positive PCR assay for a single specific target
without further testing is considered presumptive
evidence of novel coronavirus infection.
INTERPRETATION OF LABORATORY RESULTS
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No virus-specific prevention or treatment (e.g. vaccine
or antiviral drugs) is available.
Only supportive management of patients who have acute
respiratory failure and septic shock as a consequence of
severe infection.
Because other complications have been seen (renal
failure, pericarditis, DIC) clinicians should monitor for
the development of these and other complications of
severe infection and treat them according to local
management guidelines.
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Section 1 focuses on the early recognition and management of
patients with SARI and includes early initiation of supportive
and infection prevention and control measures, and therapeutics.
Section 2 focuses on management of patients who deteriorate and develop severe respiratory distress and ARDS.
Section 3 focuses on the management of patients who
deteriorate and develop septic shock .
Section 4 focuses on ongoing care of the critically ill patient
and best practices to prevent complications.
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Yes.
WHO and CDC have not issued travel health
warnings for any country related to novelcoronavirus.
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