The influenza virus has –
Correct Answer: 8 segments of ssRNA
Description: Influenza virus
Belong to orthomyxoviridae → Envelope, RNA virus
Contain single stranded RNA which is segmented → 8 pieces
There are three viral subtypes
1. Type A → Causes all pandemics and most of the epidemics
2 Type B → Can cause epidemics
3. Type C → Causes endemic infection
Three types of influenza viruses are circulating in world →A(H1N1), A(H3N2) and B
A new type has been recognized →A (H5N1)
Source of infection → Case or subclinical case
Mode of transmission → Droplet infection by respiratory route
Incubation period → 18-72 hours
Clinical manifestations
Most infections are subclinical
Fever, headache and myalgia
Respiratory → coughing
There is no viremia
Complications
Pneumonia → M.C. by str. pneumoniae
Worsening of COPD
Encephalitis
Reye’s Syndrome→ with type B virus
GB. Syndrome
GI Symptoms (gastric flu)→ Type B virus
Laboratory diagnosis
Most commonly, the diagnosis is established by the use of rapid viral tests that detect viral nucleoprotein or neuraminidase.
Category:
Microbiology
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