Immunoelectron microscopic comparisons of caliciviruses

Area of Science:

• Virology
• Comparative Immunology
• Marine Mammal Health

Background:

• Vesicular Exanthema of Swine Virus (VESV) causes significant economic losses in swine production.
• Caliciviruses are a diverse group of viruses affecting various animal species, including marine mammals and felines.
• Understanding antigenic relationships between different calicivirus serotypes is crucial for disease control and vaccine development.

Purpose of the Study:

• To compare the antigenic relatedness of Vesicular Exanthema of Swine Virus (VESV) serotypes with marine caliciviruses and feline calicivirus (FCV).
• To investigate cross-reactivity among different calicivirus isolates from swine, marine animals, and felines.

Main Methods:

• Immunoelectron microscopy was employed to assess viral antigenicity.
• Nine VESV serotypes were compared against five San Miguel sea lion virus serotypes and seven marine animal calicivirus isolates.
• Comparisons also included the vaccinal strain of feline calicivirus (FCV) F-9.

Main Results:

• Eight out of nine VESV types demonstrated common antigenicity with San Miguel sea lion virus.
• Two VESV types showed cross-reactivity with FCV F-9.
• All twelve marine caliciviruses exhibited common antigenicity with VESV, but not with FCV F-9.

Conclusions:

• VESV shares significant antigenic properties with marine caliciviruses, particularly San Miguel sea lion virus.
• The study suggests a closer antigenic relationship between VESV and marine caliciviruses than with FCV.
• These findings have implications for understanding calicivirus evolution and host-range dynamics.