Influenza Viruses Classification

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Questions and Answers

What family do influenza viruses belong to?

Retroviridae

Paramyxoviridae

Arenaviridae

Orthomyxoviridae (correct)

How many types of influenza viruses are there?

Three types: A, B, and C

Which of the influenza viruses can infect humans?

All three can infect and cause similar symptoms in humans

If you are immune to one type of influenza, you are also immune to the others.

False Signup and view all the answers

What is the host range of Influenza A?

Humans, pigs, horses, birds, marine mammals Signup and view all the answers

What is the host range of Influenza B?

Humans only Signup and view all the answers

What is the host range of Influenza C?

Humans and pigs Signup and view all the answers

What are the epidemiological characteristics of Influenza A?

Antigenic shift and antigenic drift Signup and view all the answers

What are the epidemiological characteristics of Influenza B?

Antigenic drift only Signup and view all the answers

What are the epidemiological characteristics of Influenza C?

Antigenic drift only Signup and view all the answers

What are the clinical features of Influenza A?

May cause pandemics with significant mortalities in affected young people Signup and view all the answers

What are the clinical features of Influenza B?

Severe disease, generally confined to elderly or high-risk individuals, pandemics not seen Signup and view all the answers

What are the clinical features of Influenza C?

Mild disease, common in children, without seasonality Signup and view all the answers

How many gene segments are in the genome of Influenza A?

8 gene segments Signup and view all the answers

How many gene segments are in the genome of Influenza B?

8 gene segments Signup and view all the answers

How many gene segments are in the genome of Influenza C?

7 gene segments Signup and view all the answers

What is the structure of Influenza A?

10 viral proteins; M2 unique Signup and view all the answers

What is the structure of Influenza B?

11 viral proteins; NB unique Signup and view all the answers

What is the structure of Influenza C?

9 viral proteins; HEF unique Signup and view all the answers

Study Notes

Influenza Virus Classification

Influenza viruses belong to the Orthomyxoviridae family.
There are three main types of influenza viruses: A, B, and C.
All three types can infect humans, leading to similar symptoms.
Immunity to one type of influenza does not provide protection against the others.

Host Range

Influenza A can infect a wide range of hosts: humans, pigs, horses, birds, and marine mammals.
Influenza B is limited to humans only.
Influenza C can infect both humans and pigs.

Epidemiology

Influenza A experiences both antigenic shift and drift, allowing for significant genetic variation.
Influenza B undergoes only antigenic drift, resulting in less variation than A.
Influenza C also exhibits antigenic drift without significant variation.

Clinical Features

Influenza A has the potential to cause pandemics, particularly affecting younger populations with significant morbidity and mortality.
Influenza B may lead to severe disease, primarily in the elderly or high-risk groups, but pandemics are not commonly observed.
Influenza C typically results in mild disease, particularly in children, and lacks seasonality.

Genome Structure

Influenza A and B genomes each consist of 8 gene segments.
Influenza C has a genome composed of 7 gene segments.

Viral Structure

Influenza A has 10 unique viral proteins, with M2 protein being distinct.
Influenza B is characterized by 11 viral proteins, with NB protein as its unique feature.
Influenza C contains 9 viral proteins, including the unique HEF protein.

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Description

Explore the classification of influenza viruses with this set of flashcards. Learn about the Orthomyxoviridae family and the specifics of types A, B, and C. This quiz will help you understand how different influenza viruses can affect humans and the nuances of immunity among them.