Can any doctors explain why do people use benzalkonium chloride or other types of Quaternary ammonium
In many countries, people who have recovered are found to be infected again. And people who are infected, while recovered, have suffered long term repercussions such as pulmonary fibrosis? How likely is this in Singapore?
Also, there are claims and even a local specialist mentioned that Vitamin D might be somewhat useful in capsules. How strong is this statement?
any doctors can shed some light?