81. EMERGING VIRUSES Flashcards

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1
Q
  1. Define: Emerging Viruses.
A
  • these are viruses that suddenly become apparent

EXAMPLES:
- flu pandemic of 2009
- Covid

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2
Q
  1. What causes Flu epidemics?
A
  • they are caused by new strains of the influenza virus
  • people have little immunity to this
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3
Q
  1. What has caused the spread of new viral diseases?
A
  • the spread of viruses from animals to humans
  • they can cause pandemics

THE VIRAL STRAINS:
- will jump from one species to another
- the highly pathogenic animal virus strain will combine
with the human virus strain
- this will result in a highly pathogenic human strain
- human beings will not have the immunity to protect
themselves against this new strain

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4
Q
  1. What are pandemics?
A
  • they are global epidemics
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5
Q
  1. What was the Swine Flu?
A
  • this is the name given to the 2009 Swine Flu
  • it was likely passed from pigs to humans
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6
Q
  1. What happened globally in 1918-1920?
A
  • the 1918 Flu Pandemic
  • this was the Spanish Flu

IT KILLED:
- 20 to 100 million people

IT HAD A CASE FATALITY OF:
- 2%

IT WAS CAUSED BY:
- the H1N1 virus

IT HAD A PANDEMIC SEVERITY INDEX OF:
- 5

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7
Q
  1. What happened globally in 2009-2010?
A
  • the 2009 Flu Pandemic

IT KILLED:
- 18 000 people

IT HAD A CASE FATALITY OF:
- 0.03%

IT WAS CAUSED BY:
- the H1N1 virus

IT HAD A PANDEMIC SEVERITY INDEX OF:
- it was too small to be significant
- this was a result of the Flu Vaccine being developed

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8
Q
  1. What does SARS-CoV-2 stand for?
A
  • Severe Acute Respiratory Syndrome Coronavirus 2
  • it is the 7th Coronavirus that has infected people
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9
Q
  1. What does the SARS-CoV-2 virus strain cause?
A
  • it causes a respiratory illness
  • this is known as CoronaVirus Disease 2019
  • COVID-19
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10
Q
  1. What kind of Virus is the SARS-CoV-2 strain?
A
  • it is an enveloped virus
  • it is a Positive Sense Virus
  • it runs in the 5’-3’ Orientation
  • it is a single stranded RNA virus
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11
Q
  1. What do viruses such as SARS-CoV (2003),
    MERS (2012), SARS-CoV-2 (2019) result in?
A
  • they cause serious respiratory disease

ANOTHER 4 CORONAVIRUS STRAINS CAUSE:
- common cold symptoms

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12
Q
  1. Where did Covid-19 originate?
A
  • it originated in China
  • in the Hubei Province
  • this happened in December 2019
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13
Q
  1. What is the origin of Covid-19?
A
  • it is a Zoonotic disease
  • it was passed from bats to humans
  • this happened through the use of an intermediate host
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14
Q
  1. How does Covid-19 enter the human body?
A
  • it binds to a receptor
  • this is called Angiotensin
  • it is found in human cells

COVID-19:
- then converts the enzyme 2 (ACE-2)

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15
Q
  1. What is the current death count due to Covid-19?
A
  • more than 6.87 million deaths
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16
Q
  1. Why was SARS-CoV-2 given the name
    “Corona Virus”?
A
  • it has a crown like appearance
17
Q
  1. What is the life cycle of SARS-CoV-2?
A
  1. ATTACHMENT
    - entry of the viral cells into the host
  2. UNCOATING
  3. RNA REPLICATION
    - gene expression
  4. ASSEMBLY
  5. RELEASE
  6. MATURATION
18
Q
  1. Which antiviral drugs are currently approved to aid with Coronavirus?
A
  1. Remdesivir
  2. Molnupravir
  3. Nirmatrelvir (Ritonavir)
  • they all inhibit Protease
  • this is an enzyme found in the Host Cell
19
Q
  1. List the common symptoms of Covid-19?
A

COMMON COLD SYMPTOMS:
- fever
- cough
- fatigue
- shortness of breath
- loss of smell and taste
- loss of appetite
- sputum production
- muscle pains
- joint pains

20
Q
  1. What are the complications related with Covid-19?
A
  • pneumonia
  • multi-organ failure
  • cytokine storm
21
Q
  1. How is Covid-19 Transmitted?
A
  • it is an air-borne virus
  • it is transmitted through Respiratory Droplets
22
Q
  1. How is Covid-19 Diagnosed?
A
  1. REAL-TIME REVERSE TRANSCRIPTION POLYMERASE
    CHAIN REACTIONS (rRT-PCR)L
    - this is a nasopharyngeal swab sample
    - it includes viral particles
    - this helps to detect the viral RNA
  2. ANTIGEN TESTS
    - these are rapid tests and self tests
    - the viral antigen is detected from the nasal and
    nasopharyngeal swab
23
Q
  1. How do RT-PCR tests work?
A

THE VIRAL DNA:
- is exposed to Reverse Transcriptase
- this is an enzyme
- it makes copies of the DNA (cDNA)

THE CDNA:
- is exposed to DNA Polymerase
- this is an enzyme
- it produces even more cDNA
- about another 30-40 copies

24
Q
  1. What is the function of the PCR?
A
  • it will amplify the viral cDNA
  • this makes it produce many more copies
  • this is because the viral cDNA is very sensitive to PCR
25
Q
  1. How many cases of Covid-19 have been reported to date?
A
  • 689 million
26
Q
  1. What is the Case Fatality Rate of Covid-19?
A
  • it is around 1.02%
27
Q
  1. Which three categories of drugs treat Covid-19?
A
  1. Anti-viral drugs
  2. Anti-inflammatory drugs
  3. Neutralising Antibodies
28
Q
  1. What are the Anti-Viral drugs that were used to treat Covid-19?
A
  1. REMDESIVIR
    - this is a Viral RNA Polymerase Inhibitor- Nucleoside
    Analogue
    - this drug is used in emergency situations
    - this is when we are dealing with critically ill Covid-19
    patients
    - it was approved in October of 2020
  2. MOLNUPIRAVIR
    - this is a Viral RNA Polymerase Inhibitor-Nucleoside
    Analogue
    - it was approved in December of 2021
    - it is used in cases when we cannot use Remdesivir
  3. NIRMATRELVIR (RITONAVIR)
    - its market name is Paxlovid
    - it was approved in January of 2022
    - it is a Pfizer Protease Inhibitor
29
Q
  1. What are Anti-Inflammatory drugs?
A

EXAMPLE:
- Dexamethasone

THIS IS A:
- corticosteroid drug
- it serves as an anti-inflammatory
- it serves as an immunosuppressant
- it is used only for patients that require oxygen support

30
Q
  1. What are Neutralising Antibodies?
A
  • they are drugs that will mimic the immune system
  • they will attack the virus
  • they are used for non-hospitalised patients that are at
    high risk
  • this was made acceptable in 2022
31
Q
  1. What are the different types of Covid-19 vaccines that are approved by the European Union?
A
  1. mRNA VACCINES:
    - Pfizer
    - Moderna
  2. VECTOR VACCINES
    - they carry viral genes
    - Johnson and Johnson (Janssen)
  3. PROTEIN SUBUNIT VACCINES:
    - Novavax