Kathmandu, June 8 -- Of the 13 people who've died in Nepal of the coronavirus as of Sunday, a majority have tested positive for Covid-19 only after their deaths, raising questions behind their causes of death and why they were not tested earlier.

Some have even tested positive a week after their death, when their bodies had already been cremated by their families. Samples from a 70-year-old man who died on May 17 at the National Medical College's teaching hospital in Birgunj tested positive for Covid-19 on May 25.

Among the 13, a 29-year-old woman from Sindhupalchok tested positive three days after death; a 25-year-old man from Banke died in quarantine at Narainapur and tested positive after death; a 35-year-old man from Arghakhanchi di...