This finding underlines the importance of changing bedsheets and pillowcases more frequently than usual during these unprecedented times, especially if someone you are not quarantining with is present to spend the night at your house.
Hence, in addition to keeping your footwear outside the house and tossing clothes in the bin after you have come from outside, consider washing your pillowcases every alternative day and bedsheets at least twice a week.
Remember, even though there is no hard and fast rule about the washing of beddings, there is nothing wrong with being extra cautious during a pandemic, especially if you have a guest at your house.