Why do doctors suggest that people get a flu vaccine each year?

Viruses can mutate from year to year.

Vaccines are absorbed by the body after a year.

Vaccines get stronger over time.

Viruses replicate more rapidly over time.

Ten people became sick with the flu after attending a school dance. What is the scenario that could BEST explain how the people got sick?

contact with an infected person

contact with environmental sources

contact with an infected animal

contact with a contaminated object

by preventing transmission between people

by wearing clean clothing daily

by performing dental hygiene three times each day

NCSCOS Grade 8 Science - Topic: 8.L.1 Structures and Functions of Living Organisms -Agents of Disease | Quizalize