Haemophilus influenzae is a causative agent of:

The correct answer is Option (2) → Pneumonia

(1) Common cold — Incorrect. The common cold is caused by rhinoviruses. These viruses infect the nose and the respiratory passage, but not the alveoli of the lungs.

(2) Pneumonia — Correct. Pneumonia is an infection of the alveoli, the air-filled sacs of the lungs. The alveoli fill with fluid and breathing becomes difficult. The bacteria Streptococcus pneumoniae and Haemophilus influenzae cause it. Its symptoms are fever, chills, cough and headache.

(3) Malaria — Incorrect. Malaria is caused by the protozoan Plasmodium and is spread by the female Anopheles mosquito.

(4) Typhoid — Incorrect. Typhoid is caused by the bacterium Salmonella typhi, which spreads through contaminated food and water. It is not caused by Haemophilus.

NCERT Extract:
Common Diseases in Humans – …