Accross
1. This is Second dose after the first
3. The greatest defence of the body against diseases.
5. These can be produced within the body naturally or through vaccines
6. Drugs supposed to fight against visuses.
7. Scare of diseaase of very big proportion
9. Another name for Eepidemic
10. Things which have existed within our body from time immemorial but now are said to cause respiratory infection
11. Same virus but feebled.
Crossword