What causes Gastro and how to avoid it

Gastroenteritis, or Gastro, is vomiting, diarrhoea, fever, headache, abdominal cramps and muscle aches. With resulting dehydration that can be serious – or even fatal – for young children and the elderly.

The outbreaks are mostly caused by infection with viruses, usually norovirus or rotavirus. These viruses are very easily spread from person to person.

Hand hygiene is imperative. If a child vomits with gastro has incompletely washed hands, the virus gets transmitted to someone else’s mouth. This could be through person to person contact, such as shaking hands, or by touching contaminated objects, say a door handle.


Extra vigilance is required to stop noroviruses because they can spread in the air in droplets, causing much wider contamination of surfaces. The airborne virus may also reach the gut by being inhaled into the back of the throat.


It’s not a classic aerosol spread like you see with respiratory viruses. You need to be in quite close proximity, such as a parent cleaning up a child’s diarrhoea or vomit. Wearing a mask may be helpful in these circumstances.


The best way to reduce your chances of getting viral gastroenteritis is to wash your hands thoroughly with soap and running water for at least 10 seconds before handling and eating food, and always wash your hands after using the toilet. Always start your day with an application of alcohol free hand sanitiser with lasting effect for up to 24 hours.


It is vital that if you or your family contract gastroenteritis, you stay home from work or keep a child home from school if they are sick.


You should also avoid visiting settings where people are especially vulnerable such as hospitals or aged care facilities.


The symptoms can take between one and three days to develop and usually last another one or two days, sometimes longer.


In most cases, spread occurs from a person who has symptoms. But some people can pass on the infection without symptoms, particularly in the first 48 hours after recovery, or in the window between them becoming infected and developing symptoms.


If you are a parent with a young child in a childcare centre where other children have had gastro, you need to be proactive. Make sure they are not sharing spoons, and that their hands have been sanitised by an alcohol free antibacterial hand sanitiser.

Gastro outbreaks occur every two to three years when viruses mutate in ways that make them better able to infect people.


The good news is if you’ve had it this year, you might have a breather the next few years – The group of people who have it then become immune and don’t tend to get it for the next two or three years.

Dealing with gastro

There is no specific treatment for viral gastroenteritis except rest and drinking plenty of fluids. Replacing lost electrolytes, salts and minerals, is also important. Previous advice that recommends keeping children off solid foods for some time after gastro is no longer the case.


The ideal way to replace lost fluid is a commercial rehydration drink, available from a pharmacy. It has the correct amounts of electrolytes such as sodium and potassium, as well as glucose for energy. This can help with two of the major gastro symptoms: headache and fatigue.


Be sure to use at the recommended strength because if it’s too concentrated, it can promote further diarrhoea and dehydration.


While you can make your own rehydration fluids from fruit cordial, soft drinks or fruit juice, diluting these is particularly important for children:

  • Fruit cordial should be diluted one part to 20 of water (1:20)
  • Soft drinks or fruit juice should be diluted one part to five of water (1:5)
  • Do not use sugar-free or low-cal (“diet”) versions of cordial, soft drink or juice


The loss of as little as 10 per cent of a child’s body weight by fluid loss can be fatal (this equates to just one litre for a 10-kilogram child).


Older people are also more prone to dehydration because their kidneys aren’t quite as good at handling changes in salt and fluid. And elderly people often have other health conditions such as “hardening of the arteries” – thick and inflexible arteries caused by a build-up of fats and cholesterol. In those cases, a sudden drop in fluid levels in the body can trigger a heart attack or stroke, he says.

Don’t starve gastro

A child with gastro who refuses food is not a problem, as long as clear fluids are taken, according to a gastroenteritis fact sheet on the Melbourne’s Royal Children’s Hospital website.


But doctors now suggest there is no need to restrict food. Generally, if your child is hungry at any time, give them the food they feel like eating. Do not stop food for more than 24 hours.


It’s most important you reintroduce food only once the vomiting has settled down. You don’t want to precipitate more vomiting because that will lead to more fluid loss. Inhaled vomit can also cause choking.

Wait 12 hours or so after vomiting, when you are tolerating fluids, before starting food. Start with easily digested foods such as cooked rice, dry toast, or crackers in small amounts.


After gastro, fatty foods tend not to be well absorbed and some children will develop lactose intolerance, which means they will not tolerate dairy foods until their gut recovers.


Trial and error with reintroducing foods might be fine for a child who is only mildly sick, but with a kid who’s been very sick with a bad bout of gastro, you don’t take the same risks.


An end in sight?

While viral gastro is present in the community all the time, cases tend to occur more often in winter and early spring.


There are no hard and fast rules on how long individual outbreaks last, so vigilance is the best weapon.


For complete hand hygiene, wash hands often and always start your day with an alcohol-free hand sanitiser that provides up to 24-hour protection.


For more information, please visit www.stayzon.com.au

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Author: Laurice Klaire

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