A boy who is fond of swimming in a pond finds himself passing urine with traces ...

A boy who enjoys swimming in a pond has noticed that he is passing urine with traces of blood in it. This could be a cause for concern. The question is asking which disease the boy is likely to have contracted. The options are schistosomiasis, onchocerciasis, poliomyelitis, and salmonellosis.

Schistosomiasis is the correct answer. It is caused by a parasitic worm that enters the human body when it comes into contact with contaminated water sources, such as ponds. Symptoms include blood in urine or stool, abdominal pain, and diarrhea. Onchocerciasis is caused by a parasitic worm that is spread by the bite of black flies. Symptoms include itching, skin rash, and vision impairment. Poliomyelitis is caused by a virus that attacks the nervous system. Symptoms include fever, headache, and paralysis. Salmonellosis is caused by bacteria found in contaminated food or water. Symptoms include diarrhea, fever, and abdominal cramps.

It is important to avoid swimming in ponds or other bodies of water that may be contaminated with parasites or bacteria. If you suspect that you may have contracted a waterborne illness, it is important to seek medical attention as soon as possible. To prevent such infections, people should avoid swimming in potentially contaminated water sources, or use protective gear such as boots and gloves when in contact with such water. It is also important to maintain good hygiene practices such as hand washing and proper disposal of waste.