Morphological method for estimation of simian virus 40 infectious titer.

Area of Science:

• Virology
• Cell Biology
• Microbiology

Background:

• Accurate viral titration is crucial for virology research.
• Traditional methods like plaque assay and cytopathic effect assays have limitations.
• Simian virus 40 (SV 40) requires reliable quantification methods.

Purpose of the Study:

• To adapt a cytomorphologic titration method for simian virus 40 (SV 40).
• To evaluate the efficacy of inclusion body counting for SV 40 quantification.
• To compare the novel method with established viral titration techniques.

Main Methods:

• Utilized a previously established cytomorphologic technique for adenovirus titration.
• Applied this method to estimate the infectious titer of simian virus 40 (SV 40).
• Quantified infected cells exhibiting characteristic intranuclear inclusions.

Main Results:

• The cytomorphologic method successfully estimated SV 40 infectious titer.
• Intranuclear inclusions in infected cells were reliably determined.
• Results showed strong correlation between inclusion counting (IFU/ml) and plaque count (PFU/ml).

Conclusions:

• The cytomorphologic inclusion counting method is a valid approach for SV 40 titration.
• This method presents advantages over conventional plaque assays and cytopathic effect evaluations.
• Inclusion Forming Units/ml (IFU/ml) provide a comparable measure to Plaque Forming Units/ml (PFU/ml).