Read the following list of diseases: (i) Chlamydiosis (ii) Typhoid (iii) Trichomoniasis (iv) Genital warts (v) Pneumonia (vi) Syphilis How many of the diseases listed above are classified as sexually transmitted infections (STIs)?

Step-by-step solution

According to NCERT, diseases or infections which are transmitted through sexual intercourse are collectively called sexually transmitted infections (STIs). From the given list: Chlamydiosis, Trichomoniasis, Genital warts, and Syphilis are STIs. Typhoid and Pneumonia are not STIs (they are transmitted via contaminated food and water, and droplet infection respectively). Therefore, exactly 4 diseases from the list are STIs. Answer: 4