CHP continues to investigate food poisoning clusters involving passengers on flights from Nepal
The Centre for Health Protection (CHP) of the Department of Health today (January 10) continued to investigate a food poisoning cluster involving passengers on a flight arriving in Hong Kong from Nepal yesterday (January 9). The cluster is believed to be epidemiologically linked to a food poisoning cluster announced on January 8, in which the affected people had similar symptoms and had consumed similar food items before the onset of the illness. The two clusters involved a total of 36 people. The CHP appealed to passengers travelling on Cathay Pacific Airways Limited (CX) flights (flight number: CX640) from Kathmandu to Hong Kong and landing on January 8 and 9 to call the CHP hotline (2125 2372) for an appropriate health assessment.
The cluster reported on January 9 involved 20 persons (14 males and six females) aged between 11 and 51 coming from eight unknown families/groups. They developed food poisoning symptoms, including vomiting, diarrhoea, nausea, abdominal pain and fever, about 10 to 30 minutes after consuming in-flight meals. Thirteen of them sought medical advice upon landing in the early morning of January 9. None required hospitalisation. Other than the food served on the flight, the CHP's investigation did not find that they had consumed any common food before boarding the plane.
Regarding the cluster announced on January 8, the number of affected people has increased to 16. The six newly reported cases included one male and five females. Of the 16 people, nine were from the same exchange group, and the remaining seven do not know each other. They arrived in Hong Kong on the early morning of January 8 and developed food poisoning symptoms, including vomiting, nausea, abdominal pain and fever, about 10 to 30 minutes after having meals served on the flight. The investigation revealed that the seven persons who were not part of the exchange group had not consumed any common food before boarding the plane.
The CHP is conducting a comprehensive investigation into the two cases from various angles, including reviewing the food consumed by the symptomatic persons before the onset of illness, such as bread, fruits, beetroot salad, lamb rice, chicken rice and ice-cream, which were common food items served on the flights concerned, as well as other food items consumed at the airport or in Nepal prior to boarding. Investigators took samples for testing from the same batch of food that was not served to passengers on either flights.
The CHP is still actively investigating the incidents and does not rule out the possibility that the number of people affected may increase. Staff of the CHP and the Centre for Food Safety of the Food and Environmental Hygiene Department have conducted an inspection at the Cathay Pacific Catering Service (H.K.) Limited, which supplied the food for the flights concerned, and the aircraft concerned to examine the food preparation process and hygiene. The investigation found that the food concerned was stored at an appropriate temperature and in an appropriate manner. However, as the beetroot salad requires more manual preparation and does not need to be reheated before consumption, the CHP has, as a precaution, instructed the premises concerned to suspend the supply of beetroot salad immediately.
The CHP has reported the cases to the World Health Organization and the Nepalese health authority, and inquired whether there are any other reports from other places of food poisoning among passengers on flights from Nepal to destinations other than Hong Kong. The CHP appealed to those who were on the flights operated by CX (flight number: CX640) from Kathmandu, Nepal, to Hong Kong on January 7 and 8 (Nepal time) to call the CHP hotline for follow-up and medical surveillance. The hotline has been in operation since January 9 and will continue until January 17, from 9am to 5pm, Monday to Friday, and from 9am to 1pm on Saturday and Sunday. They should seek medical advice immediately if they develop symptoms of infection, such as fever or feeling unwell.
To prevent foodborne diseases, members of the public are reminded to maintain personal, food and environmental hygiene at all times. When dining out, one should:
Avoid eating raw seafood;
Be a discerning consumer in choosing cold dishes, including sashimi, sushi and raw oysters at a buffet;
Choose pasteurised eggs, egg products or dried egg powder for dishes that often use lightly cooked or uncooked eggs;
Patronise only reliable and licensed restaurants;
Store and reheat pre-cooked or leftover foods properly before consumption;
Ensure food is thoroughly cooked before eating during a hotpot or barbecue meal;
Handle raw and cooked foods carefully and separate them completely during the cooking process;
Use two sets of chopsticks and utensils to handle raw and cooked foods;
Avoid patronising illegal food hawkers;
Drink boiled water;
Refrain from trying to use salt, vinegar, wine or wasabi to kill bacteria as they are not effective; and
Always wash hands before eating and after going to the toilet.
CHP reminds public to take precautions against cold weather
The Centre for Health Protection (CHP) of the Department of Health (DH) today (January 3) reminded the public, particularly the elderly, people with chronic illnesses, outdoor workers, pregnant women, infants and children, to adopt appropriate measures to protect their health in view of the cold weather.
Photo source: reference image
Elderly and people with chronic illnesses
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A spokesman for the CHP said that in general, elderly people have less insulating fat, and their body temperature control mechanisms would be weaker. Their body may not respond appropriately to the cold weather. In addition, some senior persons may have decreased mobility, which can impair their ability to generate and conserve body heat.
Chronic illnesses, such as hypertension, diabetes or hypothyroidism, would lower their metabolic rate, subsequently causing their body to generate less heat. Besides, persons with chronic illnesses, such as chronic respiratory illnesses or cardiovascular and cerebrovascular diseases, are vulnerable to disease aggravation due to cold weather.
The spokesman reminded the public, in particular the elderly and persons with chronic illnesses, to adopt the following preventive measures:
- Take note of the weather forecast. Wear warm clothing, including hats, scarves, gloves and socks, accordingly;
- Consume sufficient food to ensure adequate calorie intake;
- Perform regular exercise to facilitate blood circulation and heat production;
- Stay in a warm environment. Avoid going out in the morning and at night when the temperature is lower, and avoid prolonged outdoor exposure;
- Use heaters with care and maintain adequate indoor ventilation;
- Avoid alcoholic beverages. Drinking alcohol cannot keep you warm. Alcohol accelerates the loss of body heat through dilated blood vessels, resulting in chilling instead; and
- Seek medical advice if feeling unwell.
Infants, children and pregnant women
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Infants and young children are more susceptible to heat loss during the cold weather. The spokesman reminded parents that they should ensure babies are sufficiently warm, but it is also important to keep babies relatively lightly clothed to avoid overheating them. When children engage in outdoor activities, their clothing should be adjusted accordingly, and changed quickly if soaked. Infants, young children and pregnant women should also try to avoid going out in the morning and at night when the temperature is lower.
Parents should observe the following safety measures when putting their children to bed:
- Keep the room well ventilated and at a comfortable temperature;
- Always place babies on their backs to sleep. Leave their heads, faces and arms uncovered during sleep;
- Babies do not need pillows. Place babies on a firm and well-fitted mattress to sleep. Avoid soft objects, pillows and loose bedding;
- Let babies sleep in a cot placed near their parents' bed; and
- Maintain a smoke-free environment.
Outdoor workers
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Outdoor workers should take heed of the weather report and wear appropriate warm clothing for work. Clothing should be changed as soon as possible if soaked. When the Cold Weather Warning is in force, they should take appropriate precautions. They should take a break immediately and seek help and medical attention if feeling unwell.
General public
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In addition, many respiratory pathogens, including influenza and SARS-CoV-2, may have increasing activity and community transmission during winter. Seasonal influenza vaccination is recommended for all persons aged 6 months or above, except those with known contraindications. Persons at higher risk of getting influenza and its complications, including the elderly and children, should receive seasonal influenza vaccinations early. Please see details of the vaccination schemes on the CHP's website.
A person who gets influenza and COVID-19 at the same time may become more seriously ill and would have a higher risk of death. It is important for elderly persons, especially those residing in residential care homes, to receive both a seasonal influenza vaccination and a COVID-19 vaccination. They should also receive an additional booster against COVID-19 according to recommendations as soon as possible. The public should also maintain good personal and environmental hygiene against respiratory illnesses and note the following:
- Surgical masks can prevent transmission of respiratory viruses from ill persons. It is essential for persons who are symptomatic (even if having mild symptoms) to wear a surgical mask;
- Wear a surgical mask when taking public transport or staying in crowded places. It is important to wear a mask properly, including performing hand hygiene before wearing and after removing a mask;
- Avoid touching one's eyes, mouth and nose;
- Wash hands with liquid soap and water properly whenever possibly contaminated;
- When hands are not visibly soiled, clean them with 70 to 80 per cent alcohol-based handrub;
- Cover the mouth and nose with tissue paper when sneezing or coughing. Dispose of soiled tissue paper properly into a lidded rubbish bin and wash hands thoroughly afterwards;
- Maintain good indoor ventilation;
- When having respiratory symptoms, wear a surgical mask, refrain from work or attending classes at school, avoid going to crowded places and seek medical advice promptly; and
- Maintain a balanced diet, exercise regularly, take adequate rest, do not smoke and avoid overstress.
Food-borne diseases, particularly those linked to hotpot cuisine, are also common in cold weather. The following preventive measures should be taken:
- Wash hands before handling and consuming food;
- Do not patronise unlicensed vendors or those with poor hygienic standards while selecting food;
- Wash and cook all food thoroughly;
- Vegetables should be washed thoroughly in clean running water before cooking and consumption. When appropriate, scrub vegetables with hard surfaces with a clean brush to remove dirt and substances, including pesticide residues and contaminants, from surfaces and crevices;
- Shrimps should be fully cooked until the shells turn red and the flesh turns white and opaque;
- For shellfish such as scallops and geoduck, scrub the shells thoroughly and remove internal organs;
- Do not eat any undercooked freshwater aquatic products. To ensure that the food is thoroughly cooked, the centre of the food should reach a temperature of at least 75 degrees Celsius so as to destroy pathogens;
- Most hotpot ingredients should be stored in a refrigerator at 4 degrees C or below, while frozen food should be stored in a freezer at -18 degrees C or below;
- Never use raw eggs as a dipping sauce for hotpot; and
- Use different sets of chopsticks to handle raw and cooked food to avoid cross-contamination.
In addition, when using fuel-burning appliances, especially in indoor areas, the public should ensure adequate ventilation to avoid harmful exposure to carbon monoxide (CO) and prevent CO poisoning.
Fo more health information, the public may call the DH's Health Education Infoline (2833 0111) or visit the CHP's website and Facebook Fanpage as well as press releases of the Labour Department on precautions against cold weather for outdoor workers and their employers when the Cold Weather Warning is in force.
The public may also call Dial-a-Weather (1878 200) or visit the website of the Hong Kong Observatory for the latest weather information and forecasts, or its page on Weather Information for Senior Citizens.
The Centre for Health Protection (CHP), Photo source: reference image
