of decline of virus infectivity by qRT-PCR using CRBCs
over time for the three different types of environmental
water that were tested. For an initial virus concentration of
105.7 TCID50/ml the regression lines describing the decrease in
virus titers in the three types of water could not be considered
either coincident or parallel. However, water type a and water
type c could be modeled by one regression line, while the
regression line for water type b had the same intercept but a
different (lower absolute value) slope. For an initial virus concentration
of 103.7 TCID50/ml the regression lines describing
the decreases in virus titers in the three types of water could
also not be considered either coincident or parallel. However,
water type a and water type b could be modeled by one regression
line, while the regression line for water type c had a
different intercept and a different slope.