https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3593258#.XrE0oF1wSjU.twitter
New mutation indicates that coronavirus might be weakening, study says
https://nypost.com/2020/05/05/new-mutation-indicates-that-coronavirus-might-be-weakening-study/
By Amanda Woods
May 5, 2020 | 8:37am
N.M. couple test positive five times for COVID-19 but show no symptoms They remain quarantined for 50 days and counting
A special case of COVID-19 with long duration of viral shedding for 49 days
Case 1 may tend to be a chronic infected case without infusion treatment, the virus and the host may even form a symbiotic relationship. We wondered how many patients involved in this situation. One important question is whether and how long this kind of patients keeps infective. The other important question is whether the chronic infected patients will infect through new route of transmission, such as sexual transmission. Moreover, due to the high mutation rate of ***retrovirus***, we should keep close eyes on the status of this kind of patients and the infective ability.
https://doi.org/10.1101/2020.03.22.20040071
So Vitamin D deficiency results in more severe outcomes, so we lock up the elderly indoors away from sunlight, where they will become vitamin D deficient.