complete the sentences with the verbs in brackets in the correct form of the present simple passive or past simple passive

When  were antibiotics ______ ? (discovered)

About forty million people in the world _______ with HIV which causes AI DS. (are infected)

Malaria  ___ by male mosquitoes. (is not transmitted)

How  is flu  _ on from person to person? (passed)

The plague in Florence  _ by Boccaccio in Decameron. (was described)

Many infectious diseases  _ by mice and rats. (are spread)

AIDS  on by sneezing, coughing or touching. (is not passed)