Cada pregunta de este test está cronometrada.
The smallpox virus was spread by which means?
Consumption of contaminated water
direct contact with pustular material
inhalation of virus
transmitted through insect vector
Which bacterial disease was known for causing swelling of the lymph node
Measles
polio
smallpox
diphtheria
Herd immunity is impaired because unvaccinated individuals tend to be found in clusters for cultural or medical reasons?
Which is a correct features for EFFECTIVE vaccines.
Protection against illness must last for several years
Vaccine must not itself cause death although it can cause severe illness
Vaccine can be costly and administered by any means necessary, that includes anal tablets, gross
Vaccine is not required to protect against illness resulting from exposure to live pathogen
