Zika virus

Zika is a virus that is spread by mosquito bites. The mosquitoes that can spread Zika virus are not normally found in New Zealand, but they are found in many countries around the world.

Latest updates

We are still learning about Zika virus, and as international researchers find out more about it, we update our advice from time to time. Here are the most recent updates we've made to this page.

14 June 2016: Between 1 January 2016 and 7 June, a total of 88 cases of Zika virus have been reported in New Zealand.

All cases of Zika reported in New Zealand have been connected to recent travel to countries where an outbreak was occurring.

The rise in numbers of cases reported in New Zealand this year is not unexpected. It corresponds with a rise in the number of countries reporting active transmission of the virus, including several countries in the Pacific.

Cases reported in New Zealand peaked in February, and have been consistently low since then. We anticipate that numbers will continue to be low over winter. However, it is important for anyone travelling overseas to be aware of mosquito borne illnesses which may be present, and take precautions to prevent being bitten.

  • 14 April 2016: We've produced a fact sheet (PDF, 42 KB) explaining some of the things we do know, and don't yet know, about Zika virus.
  • 14 April 2016: The CDC released a statement concluding that prenatal Zika virus infections can cause serious birth defects. 
  • 31 March 2016: We've updated our advice about sexual transmission of Zika, including advice for men who have travelled to Zika-affected areas. Check the Prevention tab for more.

Summary

The virus can be found in parts of Africa, southern Asia, the Pacific Islands, and the Americas. The virus may also be present in other countries that have the mosquitoes that are able to spread it. 

New Zealand and world health authorities are continuing to monitor the spread of Zika virus.

There are concerns that pregnant women who become infected with Zika can transmit the disease to their unborn babies, with potentially serious consequences. On 14 April 2016 the United States’ Centers for Disease Control and Prevention released a statement concluding that prenatal Zika virus infection is a cause of microcephaly and other serious brain anomalies in developing fetuses.

Reports from several countries, including Brazil, indicate an increase in severe birth defects in babies whose mothers were infected while pregnant.

There are also concerns that Zika sometimes leads to Guillain-Barré syndrome, a serious neurological disorder caused by the immune system.

There is ongoing research about how Zika can affect infected people.

Symptoms

Only around one in five people who are infected with Zika experience any symptoms. The virus causes mild symptoms that can last from 4-7 days. If someone does get symptoms, they are likely to occur within a few days to a week after being infected, but they may take up to 12 days to appear.

For those who do experience symptoms, they are likely to be mild. They can include:

  • low-grade fever
  • joint pain, especially in the small joints of the hands and feet, with possible swelling
  • muscle pain
  • headache
  • red eyes
  • rash

Zika infection may cause a rash that could be confused with other serious diseases such as measles or dengue, so it's important to check with a health care professional to rule out these diseases.

Treatment

There are no specific treatments for Zika virus. Symptoms will typically clear up after 4-7 days.

Use paracetamol for pain and fever if needed. Until a healthcare professional can rule out dengue, do not take aspirin and other non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, as there is a risk of bleeding.

Anyone with symptoms should get plenty of rest and fluids. 

If you're pregnant or trying to get pregnant, and you've recently travelled to an area with Zika, we recommend that you speak with your healthcare provider or lead maternity carer, even if you do not feel sick. It is especially important to see a healthcare provider if you develop a fever, rash, joint pain, or red eyes during your trip or within 4 weeks after travelling to a country where Zika has been reported. 

Call Healthline 0800 611 116 if you are unsure what to do.

Prevention

There is no vaccine for Zika virus. Because Zika virus is spread by mosquitoes, the best way to prevent infection is to avoid being bitten.

We recommend that people who travel to any Pacific Island country should protect themselves against mosquito bites.

If you are travelling outside the Pacific area, you should check the ECDC website for the most up-to-date list of countries with confirmed Zika virus transmissions.

Anyone who is pregnant or plans to become pregnant should consider delaying travel to an affected area.  We recommend that women travelling in Zika-affected areas protect themselves against mosquito bites and, if needed, use an appropriate contraception to prevent pregnancy. Women returning from Zika-affected areas should avoid getting pregnant for four weeks after leaving the affected country.

The risk of Zika virus being spread by means other than mosquito bites is still unclear and is likely to be a very rare occurrence.

There is very limited scientific evidence to suggest the virus can be sexually transmitted. The best way to reduce the possibility of sexual transmission of the virus, or the possibility of becoming pregnant while infected with Zika virus, is to avoid sex or use condoms.

All men who have travelled to a Zika-affected area should avoid sex or use condoms, even if you do not have symptoms.

  • If your partner is pregnant, you should abstain from sexual activity (oral, vaginal, or anal) or use condoms for the duration of the pregnancy.

  • If you have a partner who is at risk of becoming pregnant, you should abstain from sexual activity (oral, vaginal, or anal), or use condoms, for at least six months after leaving a Zika-affected area.

There is only limited evidence available at this time about how long you should abstain from sex or use condoms and international advice varies.* Initial research has found Zika virus present in semen at least two months after infection develops. However, how infectious the virus remains and how long it can possibly stay in the semen is not known.  Until more information on the duration of sexual transmission becomes available, you should use condoms or abstain from sexual activity (oral, vaginal, or anal) for at least six months after leaving a Zika-affected area.

It's important that you abstain from sexual activity (oral, vaginal, or anal) or use condoms even if you are not showing symptoms. Only one in five people who get the Zika infection will show symptoms, so it's possible to have the infection and not know it.

International organisations with advice about abstaining from sex include:

In New Zealand, we will continue to update our advice as further information becomes available.

Protect yourself from mosquitoes

Everyone who is travelling to an affected country should protect themselves from mosquitoes.

  • Use insect repellents and check the label to make sure they contain DEET, picaridin, oil of lemon eucalyptus (OLE), or IR3535. Always use as directed.
    • Insect repellents containing DEET, picaridin, and IR3535 are safe for pregnant and breastfeeding women and children older than 2 months when used according to the product label. Oil of lemon eucalyptus products should not be used on children under 3 years of age.
  • If you use both sunscreen and insect repellent, apply the sunscreen first and then the repellent.
  • Wear long-sleeved shirts and long pants. You can use insect repellent to treat your clothing, as directed.
  • Use clothing and gear (such as boots, pants, socks, and tents) that has been treated with the insecticide permethrin.
  • Use insecticide spray as directed to get rid of mosquitoes.
  • Use bed nets to protect your sleeping area.
  • Stay and sleep in screened-in or air-conditioned rooms.
  • In tents, use a zip-up screen.
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