Influence of temperature and salinity on the viability and infectivity of giardia lamblia and cryptosporidia parvum

The present work was designed to assess the effect of different degrees of temperature and salinity on the viability and infectivity of G. Lamblia and C. parvum at different storage times. The results revealed that boiling of protozoa for one minute minimized their viability to less than 1% and rendered them noninfectious, while the exposure to 4C and -4C up to seven days preserved their viability and infectivity. Whereas, it was found that salinity was effective at a high concentration [50 ppt] for a long storage time at lower concentrations