In the interest of protecting women and the community from Corona, The Eden Center has compiled the following list of recommendations for women who wish to immerse in the mikveh during this time. It is intended to help you reduce the risk of contracting or passing on the disease. The choice of whether or not to immerse at this time is very individual, but these precautions should be heeded when a woman chooses to immerse. Since the situation is dynamic, please follow and conform to the health recommendations of the Israeli Ministry of Health and the CDC regarding the permissibility of immersion. Note that as of 20/4/20 the Ministry of Health and CDC have allowed mikvaot to remain open and attested that a properly treated mikveh will not pass on the virus through the water.
See guidelines for mikveh attendants here