The bacillus Haemophilus influenzae causes

Correct answers: (b) A form of meningitis in young children or (c) Pneumonia

Explanation

Haemophilus influenzae is a Gram-negative bacterium of the upper respiratory tract.

H. influenzae type b (Hib) causes pneumonia and is also a leading cause of bacterial meningitis in young children (with epiglottitis and otitis media), so both (b) and (c) are accepted here.

Whooping cough is caused by Bordetella pertussis and influenza by a virus, not this bacillus.