Rabies in marmosets (Callithrix jacchus), Ceará, Brazil

Area of Science:

• Virology
• Epidemiology
• Primatology

Background:

• Rabies virus poses a significant public health threat globally.
• Understanding rabies virus genetic diversity is crucial for effective control strategies.
• Previous research has focused on rabies variants in bats and terrestrial mammals in the Americas.

Observation:

• Human rabies cases occurred in Ceará, Brazil, between 1991 and 1998.
• A novel rabies virus variant was identified in association with these cases.
• The marmoset (Callithrix jacchus acchus) was identified as the source of exposure.

Findings:

• The newly identified rabies virus variant shows no close antigenic or genetic relationship to known American strains.
• This finding indicates a distinct evolutionary lineage of the rabies virus.
• The marmoset is implicated as the reservoir or vector for this novel variant.

Implications:

• This discovery necessitates a re-evaluation of rabies surveillance and control programs in Brazil and potentially other regions.
• Further research is needed to understand the epidemiology and transmission dynamics of this new variant.
• Public health interventions may need to be adapted to address the unique characteristics of this marmoset-associated rabies virus.