Researchers at Chinese Center for Disease Control and Prevention were baffled to find traces of coronavirus in the toilet of a long-vacant apartment in February in Guangzhou. Now they may have found the possible cause. The researchers believe that pathogen may have wafted upwards through drain pipes, Bloomberg has reported. Traces of virus were detected on the sink, faucet and shower handle of the apartment bathroom. The contaminated bathroom was directly above the home of five people who had tested positive for Covid-19 a week earlier. The findings have led to concerns that coronavirus particles from stool drift into other homes via water pipes.