BRIN Warns of Potential Plague Outbreak Return in Indonesia

Researchers from the National Research and Innovation Agency of Indonesia (BRIN) have issued a warning regarding the potential resurgence of the plague in Indonesia. While human cases have not been detected in recent years, scientists caution that the country is not necessarily free from the disease.

The plague is caused by the bacterium Yersinia pestis and is recognized as one of the deadliest outbreaks in global history. In Indonesia, the disease was particularly prevalent during the early 20th century, with significant outbreaks occurring on the island of Java.

The Phenomenon of the Silent Period

Ristiyanto, a researcher at BRIN’s Research Center for Public Health and Nutrition, explained that the current absence of human cases may be attributed to a silent period. This term describes a timeframe where a disease remains undetected for a long duration but retains the potential to reappear.

Evidence supporting this risk includes the continued presence of the Yersinia pestis bacteria, as well as its vectors and reservoirs, in several enzootic regions across Indonesia. The primary vectors for the disease are fleas, which live on the bodies of rats.

Environmental and Climatic Risk Factors

The risk of the plague returning is closely linked to environmental changes that disrupt ecosystem balances. Several factors are contributing to the increased likelihood of human-rodent interactions:

• Deforestation and land conversion.
• Growth in the human population.
• The resulting shift of rat habitats closer to human settlements.

These changes increase the probability of transmission through the bites of fleas carrying the bacteria. Muhammad Choirul Hidajat, another BRIN researcher, noted that climate change is contributing to an increase in the population of fleas, further elevating the risk.

Public Health Context and Zoonotic Threats

The warning about the plague is part of a broader concern regarding zoonotic diseases in the region. BRIN researchers have also monitored other seasonal threats, such as the Nipah virus. Ni Luh Putu Indi Dharmayanti from BRIN stated that the genome of the Nipah virus has been detected in Pteropus vampyrus fruit bats in Sumatra since 2013.

The combination of environmental degradation, the persistence of disease reservoirs, and increased interaction between humans and wildlife creates a volatile situation for public health. The resurgence of the plague would be driven by the synergy of these ecological and climatic pressures.

The findings underscore the importance of ongoing surveillance in enzootic areas to prevent the transition of the bacteria from animal reservoirs back into the human population.