However, in a
previous study, viable OVMC were observed even when kept in normal
saline solution in a refrigerator for 1 month (Sithithaworn et al., 1991),
suggesting that viability and infectivity of OVMC may also affected by
other factors such as saline (Kruatrachue et al., 1982; Prasongwatana
et al., 2013) and acidic conditions (Petney et al., 2013).