viruses - impact on health Flashcards
what are viruses and how big are they
- smallest microbe
- 20-300nm
what is epidemiology
study of how disease occurs in different groups of people and why
- see patterns of disease in populations
- collect and examine medical data
what is disease frequency
the occurrence of case of disease must be related to the population risk
what viruses cause small pox
variola major and variola minor
why could small pox be eradicated
- only one strain
- did not infect animals
- diagnosis was early
- everyone infected developed symptoms
what viral family does influenza come from
RNA virus in orthomyxoviridae
what is hemagglutinin (H) responsible for in influenza
responsible for binding the viruses to the call that has been infected
what does neuraminidase (N) do in influenza
helps the virus be released from the host cell after replication
how many subtypes of H are there in influenza
18
how may subtypes of N are there in influenza
11
what types of influenza A are there
H1N1
H3N2
H5N1
what does influenza A cause
most common and widespread infections
what does influenza B cause
small epidemics of mild disease
what does influenza C cause
mild sporadic infections
what are the symptoms of H1N1 flu
fever, cough, sore throat, body aches and fatigue
what is H1N1 flu called
swine flu
what are major antigenic changes called
shifts
what are minor antigenic changes called
drifts
how is hepatitis B transmitted
infectious blood or body fluids
what does hepatitis B cause
infectious inflammatory illness of the liver
what does SARS stand for
severe acute respiratory syndrome - enveloped RNA virus
what is the shape of tobacco mosaic virus
helical nucleocapsids
what does the adenovirus cause
conjunctivitis, common cold, life threatening multi organ failure with those who have a weakened immune system
what DNA family does adenovirus belong to
1
