Questions and Answers
What family do influenza viruses belong to?
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.
Signup and view all the answers
What is the host range of Influenza A?
Signup and view all the answers
What is the host range of Influenza B?
Signup and view all the answers
What is the host range of Influenza C?
Signup and view all the answers
What are the epidemiological characteristics of Influenza A?
Signup and view all the answers
What are the epidemiological characteristics of Influenza B?
Signup and view all the answers
What are the epidemiological characteristics of Influenza C?
Signup and view all the answers
What are the clinical features of Influenza A?
Signup and view all the answers
What are the clinical features of Influenza B?
Signup and view all the answers
What are the clinical features of Influenza C?
Signup and view all the answers
How many gene segments are in the genome of Influenza A?
Signup and view all the answers
How many gene segments are in the genome of Influenza B?
Signup and view all the answers
How many gene segments are in the genome of Influenza C?
Signup and view all the answers
What is the structure of Influenza A?
Signup and view all the answers
What is the structure of Influenza B?
Signup and view all the answers
What is the structure of Influenza C?
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
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.
