Recent reports about infectious diseases have raised concerns after health authorities identified several tuberculosis clusters in Singapore and a suspected hantavirus outbreak on a cruise ship in the Atlantic Ocean.
While the news has attracted international attention, infectious disease experts say the public should remain informed rather than alarmed.
Specialists from Duke-NUS Medical School in Singapore explained that the two situations involve very different diseases, transmission patterns, and levels of public risk.
One of the biggest concerns came from the suspected hantavirus outbreak aboard a cruise ship, where several passengers became seriously ill and deaths were reported. Hantavirus is a rare but potentially deadly disease carried mainly by rodents.
Professor Ooi Eng Eong from the Emerging Infectious Diseases Signature Research Program at Duke-NUS explained that hantaviruses are a large group of viruses naturally found in rats and mice.
The viruses were first identified during the Korean War after soldiers operating near the Hantan River developed severe illness now known as Korean hemorrhagic fever. Since then, scientists have discovered many different hantavirus strains in countries across Asia, Europe, and the Americas.
Different hantaviruses can cause different diseases. Some mainly affect the kidneys, while others attack the lungs and breathing system.
The outbreak linked to the cruise ship is suspected to involve hantavirus pulmonary syndrome, a severe lung disease that can quickly become life-threatening.
People usually become infected after coming into contact with infected rodent urine, saliva, droppings, or nesting materials. When rodent waste dries out, tiny virus particles can become airborne and enter the lungs when inhaled.
According to the experts, hantavirus can also spread through contaminated food or through rodent bites and scratches.
However, human-to-human transmission is extremely rare.
Professor Ooi explained that many hantaviruses do not cause severe disease in humans. In Singapore, researchers have detected evidence of Seoul hantavirus in local rodents. Although this virus can sometimes cause hemorrhagic fever with renal syndrome, most infections are mild or produce flu-like symptoms.
This differs from more dangerous hantavirus strains such as Hantaan virus and Sin Nombre virus, which have been linked to severe disease and higher death rates in some countries.
The cruise ship outbreak gained attention partly because scientists suspect the virus involved may belong to the Andes strain, one of the few hantaviruses known to occasionally spread between people.
Still, experts emphasize that the overall risk to the public remains low.
Currently, there is no vaccine or specific antiviral treatment for hantavirus infections. Doctors mainly provide supportive care such as oxygen therapy, fluids, and breathing support in severe cases.
Because treatment options are limited, prevention is considered the best defense.
Professor Ooi said rodent control remains the most important strategy for preventing hantavirus infections. This includes controlling rodent populations in homes, restaurants, ports, ships, and industrial areas where infected rodents may accidentally spread between countries.
At the same time, Singapore has also reported several linked tuberculosis clusters in the Bedok Central area.
Tuberculosis, often called TB, is a bacterial infection that mainly affects the lungs. It has existed for centuries and remains one of the world’s leading infectious diseases. However, unlike sudden outbreak viruses, tuberculosis is usually slow-moving and treatable.
Assistant Professor Shurendar Selva Kumar from Duke-NUS explained that the recent Singapore cases do not represent a large-scale outbreak or pandemic threat.
Instead, the linked cases reflect improvements in modern disease tracking technology.
Singapore’s health authorities now use whole genome sequencing as part of tuberculosis surveillance. This advanced genetic technology allows scientists to compare bacterial samples and identify whether cases are connected.
In the past, some cases may have appeared unrelated. But with modern sequencing, authorities can now detect hidden links between infections more accurately.
The three clusters identified in Singapore involved 13 cases spread across three years.
Experts say this represents a localized public health issue rather than widespread community transmission.
Tuberculosis spreads differently from many viruses. Infection usually requires prolonged close contact with a person who has active infectious TB. Casual contact or brief encounters generally do not spread the disease.
Importantly, all identified patients have already received treatment and are now considered non-infectious.
Doctors emphasize that tuberculosis is both treatable and curable when detected early.
The experts say the Singapore cases actually demonstrate the strength of modern disease surveillance rather than signs of a failing public health system.
The two recent infectious disease events also highlight how global travel, urban living, and international trade continue to shape disease risks around the world.
Cruise ships, ports, and densely populated cities can all create situations where infectious diseases spread more easily if not properly monitored.
However, scientists stress that strong surveillance systems, rapid diagnosis, rodent control, and modern medical care greatly reduce the risk of large uncontrolled outbreaks.
Overall, the experts believe the recent events should encourage public awareness and prevention efforts without causing unnecessary panic.
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Source: Duke-NUS Medical School, Singapore.
