Zika virus infection
 Zika virus infection is transmitted to people by mosquitoes carrying the virus and, rarely, by sexual transmission. Infection during pregnancy may cause serious birth defects in the baby. Pregnant women should defer to travel to Zika-affected countries (Brazil, Colombia, Mexico, Venezuela, and many more). Travellers should take measures to avoid mosquito bites to prevent infection, including insect repellent.
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| ⇐ | General Information | ⇒ |
MalariaMalaria is an infection of the liver and red blood cells caused by microscopic parasites. There are five types of parasites that cause malaria: Plasmodium ovale, P. malariae, P. knowlesi, P. vivax and P. falciparum. Malaria parasites are spread through the bite of certain mosquitoes. Mainland Australia is free of malaria, but malaria is occasionally present in the Torres Strait Islands. Australians can contract malaria while travelling in tropical and subtropical areas of Asia, Africa, Central and South America, the Pacific Islands and parts of the Middle East. Currently, approximately 500 cases of malaria are diagnosed in Australia each year - almost all are in people who have travelled to malaria-affected countries and didn't take anti-malarial medications.  Symptoms of malaria include sudden fever, chills, headache, sweating, nausea, vomiting and pain in joints and muscles. In severe cases symptoms can include seizures, confusion, kidney failure, breathing difficulty and coma. The infection is sometimes fatal. Malaria caused by the Plasmodium falciparum parasite can be especially dangerous. Malaria symptoms usually develop 9-14 days after being bitten by an infected mosquito. Occasionally symptoms develop weeks or months later. Some types of malaria can re-occur months or years after exposure.
Malaria is spread through the bite of the female Anopheles mosquito. The malaria parasites live inside the gut and salivary glands of an infected mosquito. When a person is bitten by an infected mosquito, the parasites are injected into the person's blood. The parasites then infect the liver and blood cells. When a mosquito bites a person with malaria, the mosquito may become infected and can then spread the disease. In rare cases, malaria can also be spread from person to person through blood transfusion, sharing injecting equipment, and from mother to foetus. Any person who lives in or travels to a country where malaria is present is at risk of contracting the disease. The risk is usually higher in rural areas than in cities. Those at increased risk include:
Overseas travellers can prevent malaria by avoiding mosquito bites and taking preventive antimalarial drugs that kill the parasite. Four to six weeks before travelling overseas, visit a GP or a travel health clinic for specific advice about avoiding malaria based on your itinerary and medical history. Depending on the risk of malaria in the areas you are visiting, you may be advised to take drugs to prevent malaria. The choice of antimalarial depends on a range of factors including the drug resistance patterns of malaria in the areas you will visit. It is important to take antimalarials exactly as advised by your doctor. All antimalarials need to be taken before, during and after you travel. Some need to be started several weeks before you travel. It is also very important to continue taking antimalarials as directed after you leave the affected area. Sometimes this means taking antimalarials for up to 4 weeks after you leave. No antimalarial drug is 100% effective. Travellers taking antimalarial drugs still need to protect themselves from mosquito bites. Mosquitoes can carry other diseases too - another reason to avoid being bitten. To protect against mosquitoes and reduce the risk of diseases they transmit:
For more detailed information on reducing the risk of mosquito bites at home and while travelling see the Mosquitoes are a Health Hazard information. This also includes more information on mosquito repellents. Malaria is diagnosed by special blood tests that detect malaria parasites. It is important that your doctor knows about your travel history and symptoms so the right blood test can be ordered. If you become ill with symptoms of malaria while overseas or after travelling, visit a GP or hospital emergency department as soon as possible. Tell the doctor where you have travelled, as this will help to make the right diagnosis. If you are travelling to a remote area where you know it will be difficult to access medical care, you may need to be prepared to treat yourself for malaria if you get symptoms (as well as taking drugs to prevent malaria). Speak to your doctor about this before you travel. Laboratories are required to notify cases of malaria on diagnosis to the local public health unit. Further Information For further information on safe travel see Staying healthy when travelling overseas. The Smartraveller website also has health advice for specific destinations. For more information about malaria and other travel health topics, refer to the US Centers for Disease Control and Prevention Travelers' Health site. For further information please call your local Public Health Unit on 1300 066 055 | ||
The information in the above were collected from the internet, either from government websites or from reasonably reliable health information sources. They are for general information only and should not replace the need of seeking medical care during illnesses. | ||