Hantavirus, H5N1 prompt increased screening

May 2026 brought two separate disease alerts into focus at once: an Andes hantavirus cluster linked to the expedition cruise ship MV Hondius and suspected human avian-flu cases in Navapur in India’s Maharashtra state. Health officials in both cases moved toward the same immediate response — isolate exposed people, widen screening and trace contacts. Public-health experts and clinicians said the episodes do not point to the same level of risk, but they do show why surveillance systems are being used earlier and more aggressively. Writers tracking recent outbreaks have also pointed to climate change, deforestation and global travel as conditions increasing the chance of animal pathogens crossing into people. ### Why are officials screening more people even when they say risk is low? OSF HealthCare physician Dr. Sharjeel Ahmad said the Andes virus cluster tied to the MV Hondius involved a strain that can spread between humans only in rare circumstances and usually after prolonged exposure, not brief contact. He said dozens of people were quarantined and treated at centers across the world after three deaths linked to the cruise ship outbreak. (newsroom.osfhealthcare.org) The World Health Organization, as cited in reporting on May 6, said the Andes strain is the only hantavirus known to very rarely spread between humans, and experts described the overall public risk as low. That combination — limited transmissibility but severe illness in some patients — is one reason officials are still tracing contacts and testing suspected cases. ### What happened in Navapur that prompted mass frontline testing? (newsroom.osfhealthcare.org) Maharashtra health authorities ordered RT-PCR testing for personnel involved in culling and containment operations in Navapur after two veterinary staff members developed flu-like symptoms, The Indian Express reported on May 18. The two suspected cases were identified as Ashok Lalsing Pawar, 49, and Indas Govlya Valvi, 36, both of whom had worked directly in bird-flu control measures. (gulfnews.com) Dr. Kirti Wasave, medical superintendent at Navapur Sub-District Hospital, said both men had mild symptoms including fever, sore throat, runny nose and body ache, and were admitted as a precaution. She said Pawar was discharged on May 7 and Valvi on May 8 after recovery, and added that suspected exposure cases are isolated immediately and treated with antivirals such as Tamiflu along with supportive care. (indianexpress.com) ### Why does H5N1 remain the bigger pandemic concern? H5N1 remains the more closely watched influenza threat because avian flu has a longer record of causing severe disease and death in humans than hantavirus in the current context. CNN’s avian-flu backgrounder, carried by KESQ, said only H5, H7 and H10 strains have caused deaths in humans, and described H5N1 as the most commonly seen and most deadly form. Most human avian-flu infections are tied to contact with infected poultry or contaminated surfaces, according to the same backgrounder. (indianexpress.com) In Navapur, that exposure pathway mattered because the two suspected human cases were among veterinary workers participating in culling operations inside the outbreak zone. ### Why are outbreaks being framed less as isolated scares? Gulf News reported on May 18 that experts increasingly see outbreaks as occurring in a changed environment rather than as one-off anomalies. (kesq.com) The report cited Jason Rohr of the University of Notre Dame and David Heymann of the London School of Hygiene & Tropical Medicine, who said biodiversity loss, climate change, ecosystem disruption and human encroachment into wildlife habitats are increasing opportunities for zoonotic spillover. The same report said around 75% of emerging infectious diseases come from animals. It listed Ebola, hantavirus and bird flu as examples of pathogens whose spread is shaped by closer human contact with animal hosts and by faster movement of people and alerts across borders. ### What happens next in these two alerts? A three-member team deputed by India’s Directorate General of Health Services and the Integrated Disease Surveillance Programme visited Nandurbar on May 13 to review preparedness and containment after the Navapur outbreak, The Indian Express reported. (gulfnews.com) In the hantavirus cluster, WHO-backed contact tracing, genetic sequencing and specialist lab analysis were still under way, including work by South African and international reference laboratories. (indianexpress.com)