A poster of a health centre lists the eight infections of the NCERT list: gonorrhoea, syphilis…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A poster of a health centre lists the eight infections of the NCERT list: gonorrhoea, syphilis, chlamydiasis, trichomoniasis, genital warts, genital herpes, hepatitis-B and AIDS. A student sorts them by their cause. Gonorrhoea, syphilis and chlamydiasis are caused by bacteria, and trichomoniasis is caused by a protozoan. The other four are caused by viruses.
- How many are bacterial?
- How many are viral?
- How many of the eight are not completely curable, according to NCERT?
- How many are caused by neither a bacterium nor a virus?
Need a reminder? The key ideaShow
NCERT lists eight sexually transmitted infections: gonorrhoea, syphilis, genital herpes, chlamydiasis, genital warts, trichomoniasis, hepatitis-B and HIV (AIDS). Except for hepatitis-B, genital herpes and HIV, the others are completely curable if detected early. Those three can also spread by needles, by blood and from mother to foetus. If one exposure has chance , then the chance of at least one infection in exposures is .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. The eight infections and their causes.
Plan. Count each group.
Step 1. Bacteria. Gonorrhoea, syphilis and chlamydiasis. That is .
Step 2. Viruses. Genital warts, genital herpes, hepatitis-B and AIDS. That is .
Step 3. Not completely curable. Hepatitis-B, genital herpes and HIV (AIDS). That is .
Step 4. Neither. Only trichomoniasis, caused by a protozoan. That is .
Answer: ; ; ; .
Check. , which is the whole list.
Watch out. The causes are not in the NEET syllabus text. The curable and non-curable groups are.
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