Houston: The novel coronavirus which causes COVID-19 may relieve pain, according to a new study which could explain why nearly 50 per cent of the infected people experience few or no symptoms, even though they are able to spread the disease.According to the scientists, including Rajesh Khanna from the University of Arizona in the US, nearly half of COVID-19 transmission occurs prior to the onset of symptoms, and 40 per cent of COVID-19 infections are asymptomatic."It made a lot of sense to me that perhaps the reason for the unrelenting spread of COVID-19 is that in the early stages, you're walking around all fine as if nothing is wrong because your pain has been suppressed," Khanna said.In the research, published in the journal PAIN, the.