inclusion criteria: - good general health (without serious health problems); - tested negative, by means of immunoglobulin (ig) g and igm serology tests and chain real-time polymerase chain reaction (rt-pcr), for covid-19.

inclusion criteria: - good general health (without serious health problems); - tested negative, by means of immunoglobulin (ig) g and igm serology tests and chain real-time polymerase chain reaction (rt-pcr), for covid-19.