The rhesus monkey is susceptible to experimental infection with chikungunya and Mayaro viruses as evidenced by a febrile reaction and high levels of circulating virus. These animals appeared refractory to infection with O'nyong-nyong virus. Infection with either Chikungunya or Mayaro virus protects these animals against infection with the heterologous virus. These results clearly show that the Asian rhesus monkey is a suitable laboratory animal for the serologic and immunologic study of selected group A arboviruses.
Department of Medicine, School of Medicine, University of Maryland, Baltimore, Maryland 21201.