Hepatitis A virus in environmental water samples from the Amazon Basin

Area of Science:

• Environmental Science
• Virology
• Public Health

Background:

• Hepatitis A virus (HAV) is a major waterborne pathogen.
• Brazil's Amazon Basin holds a significant portion of the global potable water supply.
• Hepatitis A rates remain high in the Amazon region despite declining national averages.

Purpose of the Study:

• To detect and quantify Hepatitis A virus (HAV) in water samples from the Amazon Basin.
• To evaluate the efficacy of nested and real-time reverse-transcription polymerase chain reaction (RT-PCR) for HAV detection.
• To assess the public health implications of HAV contamination in the Amazon's water sources.

Main Methods:

• Nested and real-time reverse-transcription polymerase chain reaction (RT-PCR) were employed.
• Water samples from the Amazon Basin were analyzed for the presence of HAV RNA.
• Viral load quantification was performed, with HAV RNA detected in the VP1-2A region.

Main Results:

• 92% of water samples tested positive for HAV.
• Viral loads ranged from 60 to 5500 copies/L, influenced by sanitation and flooding.
• Real-time RT-PCR identified HAV in samples with low viral loads where nested RT-PCR failed.

Conclusions:

• HAV is prevalent in Amazon Basin water sources, presenting a significant public health concern.
• Real-time RT-PCR is a valuable tool for monitoring HAV contamination, especially at low concentrations.
• Effective water management and sanitation are critical to mitigate HAV transmission in the region.