Responses of infant rhesus monkeys to inoculation with Mason-Pfizer monkey virus materials

Area of Science:

• Veterinary Virology
• Primate Immunology
• Pathology

Background:

• Mason-Pfizer monkey virus (M-PMV) is a known pathogen in non-human primates.
• Neonatal inoculation can lead to distinct disease manifestations.

Purpose of the Study:

• To characterize the clinical, hematologic, and pathologic outcomes of neonatal rhesus monkeys inoculated with M-PMV.
• To investigate the distribution of M-PMV within infected animals.
• To explore potential autoimmune mechanisms in M-PMV-induced disease.

Main Methods:

• Neonatal rhesus monkeys were inoculated with M-PMV and/or infected cells.
• Hematologic parameters were monitored.
• Postmortem examinations were performed, including gross pathology and tissue sample analysis for viral presence.
• Clinical signs and survival rates were recorded.

Main Results:

• Inoculated monkeys frequently developed viral/bacterial pneumonia and enteritis.
• Three distinct hematologic patterns correlated with survival probability.
• Postmortem findings included lymphadenopathy and thymic atrophy.
• M-PMV was detected in multiple organs, including lymph nodes, blood, brain, spleen, thymus, kidneys, and bone marrow.

Conclusions:

• Neonatal M-PMV infection in rhesus monkeys causes significant morbidity, including pneumonia and enteritis.
• Hematologic profiles and postmortem findings are valuable indicators of disease severity and prognosis.
• The widespread viral distribution and observed pathology suggest M-PMV can induce a complex disease, potentially involving autoimmune processes.