Serotype g12 rotaviruses, Lilongwe, Malawi

Area of Science:

• Virology
• Public Health
• Epidemiology

Background:

• Rotavirus is a leading cause of severe diarrheal disease in children globally.
• Understanding rotavirus strain diversity is crucial for vaccine development and public health interventions.
• Previous rotavirus surveillance in Malawi has primarily focused on other serotypes.

Purpose of the Study:

• To investigate the diversity of rotavirus strains circulating in children with acute gastroenteritis in Lilongwe, Malawi.
• To identify the prevalence of specific rotavirus serotypes, including G12.
• To analyze the genetic characteristics of identified rotavirus strains.

Main Methods:

• A cross-sectional study was conducted between July 2005 and June 2007.
• Fecal specimens were collected from children diagnosed with acute gastroenteritis.
• Rotavirus-positive specimens were analyzed for G-serotype, P-type, and viral protein 7 (VP7) sequences.

Main Results:

• Rotavirus was detected in 546 fecal specimens.
• Serotype G12 was identified in 30 (5%) of the rotavirus-positive specimens.
• The G12 strains exhibited diverse electropherotypes and P-types, but shared closely related VP7 sequences, indicating genetic reassortment.

Conclusions:

• Rotavirus G12 is a circulating strain in Malawi, contributing to childhood gastroenteritis.
• The genetic diversity observed within G12 strains suggests ongoing viral evolution and reassortment.
• Continued surveillance is necessary to monitor rotavirus epidemiology and inform control strategies in the region.