Five Jaundice Cases in One Hostel Block
A boys' residential school has 60 boarders sharing one mess and one water tank. In 11 days, five boys from the same hostel block develop fever, nausea, loss of appetite, dark urine and yellow eyes; all attend school and eat in the same mess. A cook who prepares the evening meal has also been unwell with similar symptoms. One affected boy had jaundice six years ago as a small child. The tank was last cleaned two months back, and a drinking-water pipe passes close to an open drain. The warden proposes sending all boarders home for a fortnight so that the outbreak stops, and wants to know whether that alone is enough. A local doctor has said the illness is 'hepatitis' without specifying the type. Two senior students share razors and one has a small tattoo done recently in the market.
1. Which hepatitis virus is most likely, and how do the time pattern, place pattern and the one boy's past history support or complicate that conclusion?
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Hepatitis A is the most likely cause. The reasoning is epidemiological: five cases in 11 days in one closed community, all sharing a mess and a water supply, is a point-source pattern typical of a faecal-orally transmitted virus. Hepatitis A has an incubation period of about 15-50 days, averaging around 28, so several boys exposed over a few days can fall ill within a compact window. The prodrome of fever, nausea, anorexia, dark urine and jaundice fits acute viral hepatitis. Hepatitis B is far less likely here because it spreads through blood, sexual contact and perinatal routes; it would produce sporadic cases rather than an explosive mess-linked cluster, and its incubation of 45-180 days does not suit this tight clustering. The shared razors and the recent tattoo are exactly the exposures that would make hepatitis B or C worth screening for, so they must be asked about, not dismissed. The boy with jaundice six years ago is a useful clue: hepatitis A confers lifelong immunity, so if that earlier episode was confirmed hepatitis A he is unlikely to be a case now, and his present illness may be hepatitis E, also water-borne.
2. List the control measures in priority order, explaining what each one interrupts.
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First, notify the district health authority or municipality, because outbreak control needs water testing and a legal record; schools often skip this and lose the chance to inspect the tank. Second, interrupt the water route: stop drinking tank water, supply boiled or chlorinated water, and get the tank and the pipe near the drain inspected and repaired; water is the common exposure all five share. Third, interrupt the food route: remove the symptomatic cook from the kitchen until medically cleared, insist on handwashing with soap after toilet use and before cooking, and provide separate serving utensils. Fourth, interrupt person-to-person spread: soap and water, bleach for toilets, no sharing of towels, toothbrushes, razors or utensils, and enteric precautions for cases for about a week after jaundice appears, when infectivity is highest. Fifth, protect contacts: hepatitis A vaccine or immunoglobulin for close contacts, ideally within two weeks of exposure, and daily symptom surveillance of all 60 boarders for 50 days to catch new cases early. Sixth, health education so boys report dark urine and jaundice instead of hiding them.
3. Evaluate the warden's plan to send all boarders home for a fortnight, and state what must accompany it.
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Closing the hostel is not wrong, but it is incomplete and can make tracing harder. It interrupts ongoing exposure only if the source is inside the premises; if the water supply or the cook is the source, and both are left untouched, the outbreak simply restarts when the boys return. Worse, boys infected during the incubation period will travel home and fall ill in their villages, where nobody is watching for a cluster and where the local health system may not link the cases; they can seed secondary household transmission. The fortnight is also too short, since the incubation period runs up to 50 days, so a boy exposed on the last day before closure could become ill well after reopening. Therefore closure must be paired with a written list of every boarder's home address and phone number, instructions to parents to report jaundice or dark urine, a named person to collate reports, completion of water repair and tank chlorination before reopening, medical clearance of kitchen staff, and vaccination of close contacts. The judgement point is that removing people does not remove the source.