Canine parvovirus: environmental effects on infectivity

Area of Science:

• Veterinary Virology
• Environmental Microbiology

Background:

• Canine parvovirus-2 (CPV-2) is a highly contagious pathogen affecting dogs.
• Understanding the environmental stability of CPV-2 is crucial for effective disinfection and disease control strategies.

Purpose of the Study:

• To investigate the infectivity of CPV-2 under various controlled indoor and outdoor environmental conditions.
• To determine the survival rates and infectious potential of CPV-2 at different temperatures and environmental exposures.

Main Methods:

• Controlled laboratory study exposing CPV-2 to various temperatures (-20°C, 4°C, 20°C and higher).
• Assessment of CPV-2 infectivity using median tissue culture infective dose (TCID50) over time.
• Evaluation of CPV-2 survival and infectivity in simulated outdoor environments.

Main Results:

• CPV-2 remained infective for over 12 months at temperatures below -20°C.
• At 4°C, CPV-2 infectivity decreased significantly over 12 months (TCID50 = 10(2.3)/ml).
• At room temperature (20°C) or higher, CPV-2 infectivity dropped below detectable levels (<10(1)/ml) within 2 months.

Conclusions:

• Low temperatures significantly enhance the environmental persistence of CPV-2.
• Warmer temperatures and outdoor conditions, particularly sunlight and drying, rapidly inactivate CPV-2.
• CPV-2 surviving in outdoor environments was non-infective to dogs, unlike virus maintained at low temperatures.