The reliability of a Covid-19 test is specified as follows:
Of people having Covid-19 , 90% of the test detect the disease but 10% go undetected. Of people free
of Covid-19 , 99% of the test are judged Covid-19 negative but 1% are diagnosed as showing Covid-19
positive .
From a large population of which only 0.1% have Covid-19 , one person is selected at random, given
the Covid-19 test and Pathologist reports him/her as Covid-19 positive.
Based on the above information , answer the following questions:
(i) What is the probability of the person to be tested as Covid-19 positive given that he is actually
having Covid-19 ?
(a) 0.001 (b) 0.1 (c)0.8 (d) 0.9
(ii) What is the probability that the person is actually not having Covid-19 ?
(a) 0.998 (b) 0.999 (c) 0.001 (d)0.111
(iii) What is the probability that the person selected will be diagnosed as Covid-19 positive ?
(a) 0.1089 (b) 0.01089 (c) 0.0189 (d) 0.189
(iv) What is the probability that the person is actually having Covid-19 given that he is tested as
Covid-19 positive ?
(a) 0.83 (b)0.0803 (c)0.083 (d) 0.089
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Answers
Answer:
Diagnostic laboratories need clear signals on test volumes and prices to be able to add capacity to cater to potential surges, says A. Velumani, managing director and founder of the Navi Mumbai-based diagnostic laboratory chain Thyrocare.
By : Govindraj EthirajUpdate: 2021-04-29 10:39 GMT
COVID-19 RT-PCR tests are 99.5% reliable
Mumbai: On April 28, 2021, India reported 360,960 COVID-19 cases and 3,293 deaths. It is evident that these numbers do not reflect the true situation, and the real situation on ground is much worse and the numbers much higher. Can we get a better handle on what's really going on in India, through what our testing capability can say about the nature of and progression of the COVID-19 virus? What is India's COVID-19 testing capability today, compared to during the first wave in 2020? Are we more able to see early signals now? Besides the tools we have like vaccinations, lockdowns and other such containment measures, what can India do at the testing site to fight back against the virus?
For answers, we spoke with entrepreneur A. Velumani, managing director and founder of the Navi Mumbai-based diagnostic laboratory chain Thyrocare.