Primary lesions called chancre are formed at the site of infection by . . . . . . .

In cabbage,......... disease is caused by bacteria.

Which bacteria are responsible for pneumonia?
$(i)$ $Streptococcus$ $typhi$
$(ii)$ $Haemophilus$ $influenzae$
$(iii)$ $Streptococcus$ $pneumoniae$
$(iv)$ $Haemophilus$ $typhi$

Which organ do the pathogens of typhoid,which enter the body through the mouth,reach first?

Haemophilus influenzae is responsible for.........

Penicillin and streptomycin antibiotics are used in the treatment of which disease?