Gastro: The basics

There’s a good chance you’ve had gastro in your life, but how much do you actually know about it?

Here, we look at the basics, including the potential causes of gastro plus top tips for avoiding it.

Gastroenteritis (or ‘gastro’) is a highly contagious infection in the digestive system which can lead to symptoms such as vomiting and diarrhoea.

There’s a variety of potential causes of gastro, but the condition usually occurs when you come into contact with:

• viruses
• bacteria
• parasites
• bacterial toxins
• chemicals
• some medications among certain people (like antibiotics).¹

The infection might be transmitted by eating or drinking something contaminated, handling sick animals or coming into contact with microscopic amounts of faeces or vomit from an infected person.

Gastro symptoms usually appear between one and 15 days after exposure. As well as vomiting and diarrhoea, symptoms may include:

• nausea
• stomach pains
• loss of appetite
• bloating
• fatigue and aches.¹

While everyone is at risk of gastro, certain people are more likely to contract it and fall more seriously ill. They include:

• older people
• young children 
• pregnant people
• people with weakened immune systems.²

You can usually recover from gastro without needing to visit a doctor. When you’re recovering from the infection, it’s important to:

• stay home until 48 hours after your symptoms have finished
• regularly wash your hands
• regularly clean and disinfect surfaces
• drink plenty of fluids.

Visit or call your GP if your symptoms are particularly frequent or severe, you have blood or mucus in your stool, you have a fever, or you’re dehydrated. Additionally, children with gastro should visit a GP if they:

• are less than 6 months old
• weigh less than 8kg
• vomit dark green
• live with another health condition
• were prematurely born
• can’t keep food or fluids down
• don’t get better.³

Your doctor may recommend going to the hospital for close monitoring and treatment for dehydration.

To avoid gastro that’s caused by bacteria or parasites in food, it’s important that you:

• wash your hands thoroughly before preparing or eating food
• store raw food such as meat, chicken and eggs separately from ready-to-eat food
• ensure that food is cooked to at least 75°C, where cooking is required
• keep cold foods below 5°C and hot foods above 60°C.

If you’re caring for someone with gastro, you can lower your chance of contracting the infection by:

• wearing a mask and gloves
• regularly washing your hands with warm soapy water
• using a separate bathroom, if possible
• covering up any cuts or abrasions on your body
• regularly disinfecting shared surfaces.

Unfortunately, gastro is a common risk when travelling to certain countries. To lower your chances of getting it, you might:

• talk to your doctor about the destination and potential precautions you might take while you’re there
• pack water purification tablets and other preventative travel medications
• practise common sense when eating food that’s prepared for you (such as asking yourself if it’s safe to eat)
• follow the same tips for caring for someone else with gastro (above) if a person you’re travelling with becomes infected.

While there are no vaccinations for the majority of gastro strains in Australia, the National Immunisation Program provides a free vaccine against the rotavirus for infants under 6 months of age.