Diphtheria is caused by
Poisons released by living bacterial cells into the host tissues
Poisons released from dead bacterial cells into the host tissues
Poisons released by virus into host tissues
Excessive immune response by the host's body
All the diseases are spread by housefly except
A person has developed interferon in his body. He seems to carry an infection of
Thalidomide is a non-barbiturate sedative drug which was to be given to pregnant women. Its use was withdrawn in $1961$ because it resulted in phocomelia. This condition illustrates