Coliform bacteria are microorganisms that primarily found in the intestines of warm-blooded animals and thus, present in animal's faeces. By testing for coliforms, especially the Escherichia coli (E. coli), one can determine if the water has possibly been exposed to faecal contamination; that is, whether it has come in contact with human or animal faeces.
Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides. Ascariasis does not spread directly from person to person. Infection occurs by eating food or drink contaminated with Ascaris eggs from feces. The eggs hatch in the intestines, burrow through the gut wall, and migrate to the lungs via the blood. There they break into the alveoli and pass up the trachea, where they are coughed up and swallowed. The larvae then pass through the stomach for a second time into the intestine where they become adult worms.
Therefore, the correct answer is option C.
Which of the following factors are causes of disease?
Poor people living in slum areas do not have access to clean drinking water or clean surroundings, this can cause infections among them. Education is a very important aspect to avoid causes of diseases. Therefore, (d) is the correct answer.
Several diseases specially diarrhea, gastroenteritis, typhoid, dysentery are very common in areas deficient in proper water supply. At many places, water from hand -pumps and other sources is contaminated. At certain places, harmful mineral contents in water obtained through wells or hand pumps cause health problems.