From CK Nayak
NEW DELHI, Jan 4: Amid drastic climatic changes, particularly in the hill state of Meghalaya, leptospirosis—a potentially fatal zoonotic infection—has now been clinically confirmed in the state for the first time. The development has raised grave concern and triggered fears of a looming public health emergency.
As many as ten laboratory-confirmed cases of human leptospirosis were treated at a tertiary charitable hospital in Shillong. All diagnoses were made in 2023 using IgM ELISA testing, marking the first documented clinical evidence of the disease in Meghalaya.
The emergence of human leptospirosis in a hilly, previously non-endemic region was recently published in the latest issue of the Indian Journal of Medical Research (IJMR). Researchers cautioned that delayed action could allow the infection to spread unnoticed, potentially turning sporadic cases into a larger outbreak.
The first-ever detection of human leptospirosis in Meghalaya comes close on the heels of similar case identification in neighbouring Assam, signalling a worrying expansion of this life-threatening communicable disease across India’s Northeast. Researchers have warned that a silent and under-recognised public health threat may be unfolding in the region.
Public health experts note that the back-to-back confirmations suggest leptospirosis is quietly expanding its footprint in areas where clinical suspicion has traditionally been low, raising fears of widespread underdiagnosis. Last year, a team of scientists from the Dibrugarh-based ICMR–Regional Medical Research Centre (RMRC), while investigating an outbreak of fever and jaundice in Assam’s Goalpara district, confirmed the involvement of Leptospira wolffii—a strain never before reported in human infections from Northeast India.
Leptospirosis is caused by Leptospira bacteria and spreads from infected animals to humans through contact with water or soil contaminated with animal urine. The illness often begins deceptively with fever, headache, vomiting, and body pain, but can rapidly progress to severe and fatal complications, including jaundice, kidney failure (Weil’s syndrome), meningitis, lung haemorrhage, heart inflammation, and internal bleeding.
Despite receiving heavy rainfall, Meghalaya has long been considered at low risk because it lacks the large-scale flooding typically associated with leptospirosis. As a result, the disease has rarely featured in routine clinical diagnosis, contributing to missed or delayed detection.
“This strongly suggests leptospirosis has been present but flying under the radar,” the researchers said. The study was authored by Deepak Rajan, Benedicta Sthuti Kumar, and Sandra Albert from the Department of Public Health, Indian Institute of Public Health Shillong, along with Meban Aibor, Kharkongor, and Eman Chynnam Lyngdoh from the Department of General Medicine, Dr. H. Gordon Roberts Hospital, Shillong.
The patients—whose mean age was just 27 years—included daily wage workers, office employees, and a farmer, indicating that no single occupational group was exclusively at risk. While some presented with mild symptoms, others arrived in critical condition.
“Alarmingly, four out of ten patients developed severe disease requiring intensive care,” the researchers reported. One of the youngest patients suffered kidney failure, liver dysfunction, severe anaemia, and dangerously low platelet counts.
Classical clinical signs such as conjunctival suffusion were largely absent, further complicating early diagnosis. However, gastrointestinal symptoms—especially abdominal pain—were observed in all severely ill patients, suggesting a potential early warning sign of disease progression, the researchers noted.
The situation is further aggravated by diagnostic gaps, with Meghalaya lacking local confirmatory testing facilities. Clinicians are forced to rely on clinical judgement while samples are sent to Mumbai—often after treatment has already begun. Ironically, leptospirosis is easily curable if detected early, but delayed diagnosis makes treatment complex, expensive, and potentially life-threatening.
Despite the absence of major floods, researchers believe Meghalaya’s high rainfall, persistent soil moisture, specific soil types, and micro-level water stagnation may support bacterial survival. Animal studies from the region have already shown high seropositivity, pointing to silent environmental circulation.
“The evidence clearly shows leptospirosis is present but underdiagnosed in Meghalaya,” the authors stated. “Low clinical suspicion, overlapping symptoms, and lack of diagnostics are masking its true burden.”
Calling the findings a wake-up call, they urged clinicians across hill states to include leptospirosis in the differential diagnosis of all acute febrile illnesses, particularly during and after the monsoon. The researchers stressed the urgent need for heightened clinical awareness, rapid diagnostic access, expanded surveillance, and identification of region-specific environmental risk factors.
