Mosquitoes and Disease Prevention

Avoiding Zika, Malaria, Dengue

aedes albopictus mosquito

An Aedes Albopictus mosquito, one of the Aedes species that is responsible for Dengue fever, Chikungunya and Zika. The other pest is Aedes Aegypti which looks very similar and has the same distinctive white markings. However, just because the mozzie has white bands doesn’t mean it’s infected with anything! It’s probably just irritating but harmless. Relax. Well, kill it then relax.

Zika virus 2016

The CDC (the US Centre for Disease Control)  informs us that Zika virus-carrying mosquitoes can be found in the Caribbean, Central and South America, Pacific Islands,  Singapore, and within the United States, specifically Florida (at the moment).
The effects are generally mild but the concern is about a probable link with brain defects in babies.
If in any doubt head elsewhere for your vacations BUT if pregnancy is not an issue due to contraception, age or gender then this may be a good time to travel in Latin America as competition for rooms and sun beds is likely to be lower than normal.

Pregnancy and travel

Only pregnant women have been advised to reconsider their plans to visit countries affected by Zika.
It is thought that within the female body the virus can travel across the placenta and affect the health of an unborn baby.
There has been a surge in microcephaly – in which the baby’s brain does not develop properly – in Brazil.

Pregnant women should reconsider their travel plans and travellers should seek advice from a health professional before departing.
Pregnant women who have to travel should take ‘scrupulous’ measures to avoid being bitten by mosquitoes.
The US Centers for Disease Control says women trying to get pregnant should “talk to your doctor about your plans to become pregnant and the risk of Zika virus infection and strictly follow steps to prevent mosquito bites during your trip.”

Is it safe to get pregnant after visiting?

The CDC says Zika lingers in the blood for approximately a week.
And: “The virus will not cause infections in a baby that is conceived after the virus is cleared from the blood.
“There is currently no evidence that Zika virus infection poses a risk of birth defects in future pregnancies.”

What about men?

Zika can be passed through sex from a person who has Zika to his or her partners, even if the infected person does not have symptoms at the time.

  • It can be passed from a person with Zika before their symptoms start, while they have symptoms, and after their symptoms end.
  • Though not well documented, the virus may also be passed by a person who carries the virus but never develops symptoms.
  • Studies are underway to find out how long Zika stays in the semen and vaginal fluids of people who have Zika, and how long it can be passed to sex partners.  Zika can remain in semen longer than in other body fluids, including vaginal fluids, urine, and blood.

It is thought the virus can persist in semen for two weeks after a man recovers from an infection.
Very few countries have specific advice for men.
Public Health England is taking a safety-first approach after one suspected case of sexual transmission.
The organisation says the risk of spreading the virus through sex is “very low” and at this stage only “theoretical”.
But it recommends using condoms if you have a pregnant partner or one who might become pregnant.
This should be done for 28 days after coming home and if you have no symptoms, and for six months if Zika symptoms do develop.

Mosquito Repellents

– the latest ‘deterrent’ is smelly socks. Scientists in Tanzania have discovered that mosquitoes prefer the odour of very smelly socks than humans, by a factor of 4: 1. In other words – a) wash your feet after a long hike and put your socks well away from your camp b) or you could try creating a box shrouded in insecticide cloth to kill the little buzzers.

Deet – The most potent mosquito repellents contain lots of Deet (Diethyl-toluamide), so check out the ingredients.
25% Deet is good, 50% is excellent and 100% Deet will force mosquitoes to leave the country; trouble is it will also dissolve your skin, so only use it on clothes or nets.
Be wary of using deet on the skin of small children.

Deet news 2015: Mosquitoes evolve very quickly according to Dr James Logan, London School of Hygiene and Tropical Medicine.
Research suggests that mosquitoes simply do not like the smell of Deet but appear to get used to it after a short time as their antenna receptors became de-sensitized.
Nevertheless Dr Logan says that deet is effective at first/in many cases and visitors to high risk areas should continue to use it.

Picaridin and IR3535 are also recommended mosquito-effective ingredients and are safe for pregnant women

– Mosiguard is relatively natural (citrodiol and eucalyptus) and often very effective, so starting with that and saving the Deet for heavy duty mozzie attacks is worthwhile.

– NeemCare Herbal Insect Repellent. Neem tree oil is used in Ayurvedic medicine and is burned in India to repel insects.
It is now on the market as a general repellent and in tests has successfully repelled the voracious midges that plague the Scottish Highlands as well as mosquitoes.
If mosquitoes do get through the defences, trials indicate that Neem oil also reduces the severity of the body’s reaction to the bite.
Personally tested when travelling in Myanmar, it worked perfectly.
Available in health stores and pharmacies, it also works against head lice.

– Refined lemon eucalyptus oil, lavender oil and citronella oil, all of which are disliked by insects; but don’t forget to dilute them with some kind of carrier oil, such a sunflower or sesame.
Alternatively bath or shower with lemon gel.

– Vitamin B1/B12. Consistent anecdotal evidence suggests that mozzies hate the smell of B1. Take 100mg a day, starting a few days before your trip. Others swear by B12. They’re both worth trying if you plan to spend a while in mosquito disease zones.

– Fish Oil capsules. e. g. Cod Liver Oil.
It must be unrefined so there is a hint of fishy smell about your person. Take a few days before leaving to build up the odour.
Think about it. . . fish eat mozzies and their larvae, so a mosquito will have an intense aversion to fish. Some people swear by this solution.

– Quercetin. You can also strengthen your body’s health system before travelling by taking an anti-inflammatory called quercetin, which is especially effective when taken with Vitamin C.

– Electric ‘vape’ mats work well in rooms, are relatively inoffensive and last longer than coils, but check local voltage and socket type.

– Electronic buzzers/sonic deterrents do not work as far as our experience goes.