Please solve this question

Dear student,
Please find below the answer:

1. Virus cause common cold and mumps.
2. Lice may readily grow in hair if not washed properly.
3. BCG (Bacille Calmette-Guerin) prevents tuberculosis.
4. Nose should be covered while sneezing.
5. Whooping Cough is another name for pertussis.
6. Flies contaminate the exposed food.
7. AIDS weakens the immune system.

Hope this clears your doubt.
Regards.