No. Although, as described previously, megalocytivirus
infections have been associated with significant mortalities
within populations—sometimes as high as 100%—low-level
infections have been seen with lower mortality rates in
some populations (Yanong, unpublished data). Several
studies using highly sensitive molecular detection methods
have demonstrated that clinically healthy fish may test
positive for megalocytivirus. It is unknown whether these
fish can serve as reservoirs for future disease outbreaks.