Precautions to Prevent Malaria

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QUESTION

What precautions can be taken to prevent malaria?

ANSWER

This is a common question.  Communities can try to control or eliminate mosquitoes (who when infected with the malaria parasite can bite humans and transmit the disease) by spraying with insecticide, using biological agents, or draining mosquito breeding areas.  These methods are called vector control. On a personal level, people can prevent being bitten by infected mosquitoes by screening their rooms, sleeping under long acting insecticide bednets, wearing protective clothing and using insect repellent. See: Malaria Prevention and Control for more information.

What measures can local people take to limit malaria infection?

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QUESTION

What measures can local people take to limit malaria infection?

ANSWER

People living in malarial areas can do a lot to protect themselves from getting malaria.  There are community programs for vector control (to control or eliminate mosquitoes) that include draining swamps to remove mosquito breeding habitat, spraying with insecticide, and using biological control techniques. In addition, to prevent  people from getting mosquito bites,   communities can educate families to screen their windows (if possible), to sleep under long lasting insecticide treated bednets, to cover their arms and legs with clothing  and to avoid being outdoors during dawn and dusk when mosquitoes are biting. Communities can also educate people to identify signs and symptoms of malaria and to seek early treatment to avoid serious disease and possibly death.  See Malaria Prevention and Control for more information.

Reduction in Child Mortality in Niger

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Niger has achieved great reductions in child mortality and gains in coverage for interventions in child survival than neighbouring countries in west Africa.
About 59,000 lives were saved in children younger than 5 years in 2009, attributable to the introduction of insecticide-treated bednets (25%); improvements in nutritional status (19%); vitamin A supplementation (9%); treatment of diarrhoea with oral rehydration salts and zinc, and careseeking for fever, malaria, or childhood pneumonia (22%); and vaccinations (11%).

Read more via The Lancet.

P. knowlesi versus P. falciparum: Treatment and Prevention

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QUESTION

I would like to know about the P. knowlesi – treatment compared to P. falciparum? preventive medicine?

ANSWER

At this point in time, P. knowlesi is completely susceptible to chloroquine, and so can be treated successfully using this drug. P. falciparum, on the other hand, is known to have widespread resistance to chloroquine, and so the World Health Organization recommends that chloroquine should not be used to treat P. falciparum malaria. Instead, for non-complicated malaria, the WHO recommends treatment with artemisinin-based combination therapies (ACTs). These drugs can also be used against other forms of malaria, including P. knowlesi, particularly if the hospital also treats cases of P. falciparum regularly and so has supplies of ACTs on hand. One study even showed that treatment with ACTs (specifically artemether-lumefantrine) was more effective than chloroquine in treating P. knowlesi. Severe cases of either infection should be treated with intravenous artesunate or quinine.

Prevention for both is roughly similar – chemoprophylaxis should be taken by people travelling to an area where transmission of these types of malaria occurs. However, given P. knowlesi‘s susceptibility to chloroquine, this drug is effective as a prophylactic for this malaria species, whereas it is not appropriate for P. falciparum, given high levels of resistance. In terms of prevention of mosquito bites, this differs due to the types of mosquito vectors each of these species of malaria uses. P. knowlesi is only found in south-east Asia, where the mosquitoes that transmit it tend to be forest dwelling. As such, people who spend time in the forest in the evening and at night are most at risk of contracting P. knowlesi. Wearing long-sleeved clothing and insecticide while in the forest may help prevention in this case. P. falciparum is found throughout the world, and uses many different species of mosquito vector. In Africa, the mosquitoes which transmit P. falciparum tend to rest indoors and thus bite people at night while they are sleeping. Therefore, in these settings, it is especially beneficial to sleep under a long-lasting insecticide treated bednet. Indoor residual spraying, which coats the inside walls of a house with insecticide to kill indoor-resting mosquitoes, can also be beneficial.

Malaria Medication During Breast Feeding

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QUESTION

I am a breast-feeding mother, and I am on the lumartem dosage. Will this affect my baby? He is 9 months old.

ANSWER

The US Center for Disease Control says that it is safe for a breastfeeding mother to take lumfartem if the baby is over 5 kilos (or 11 pounds).    Since your baby is 9 months old, he should weigh more than 5 kg so you should be fine. If you have any questions you should talk to the health care provider who gave you the medication.  Make sure you and the baby sleep under a long acting insecticide treated net to prevent further episodes of malaria.

Malaria Prophylaxis for Indonesia

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QUESTION

I have been working a 4-week rotation between the USA and East Kalimantan (Borneo) for about 2 years. While on Borneo, I am in the jungle much of the time. I have never contracted malaria. I am embarrassed to say I thought I had been inoculated for malaria when I first started working here. I just spent 10 days in a hospital last month fighting a blood degenerating viral infection not unlike hemophiliac dengue. Is there a preferred Rx I should take for malaria? I have no allergies to medicines that I am aware of. I am 57 year-old male.

ANSWER

Given the amount of time you spend in rural areas of Borneo, you probably should consider anti-malarial medication to prevent infection. There are three types of drug which are recommended against malaria in Indonesia: atovaquone-proguanil (sold as Malarone), mefloquine (sold as Lariam) and doxycycline. Each has pros and cons: Malarone and doxy have to be taken every day, while Lariam is only taken weekly, which might make it more convenient. However, both doxy and Lariam should be taken for a full 4 weeks after leaving the malarial area, while Malarone is only taken for a week after leaving.

In my opinion, Malarone has the fewest and mildest side effects (though some people complain of upset stomachs and disturbed sleep patterns), while doxycycline is sometimes a problem in the tropics since it can cause sun sensitivity. Lariam is not recommended for people with a history of mental illness, and has been reported to have psychiatric side effects, including nightmares, hallucinations and even altered behavior. Of the three, Malarone is the most expensive, and doxycycline usually the cheapest.

In terms of taking them long term, I don’t know of any studies that look at long term usage of Malarone (it is expensive enough that I doubt anyone takes it for very long trips!), while people do safely take doxycycline for periods of several months, and Peace Corps volunteers and American expats routinely take Lariam for periods of several years.

Of course, many people living long term in malarial areas do not find it convenient to take pills to prevent malaria, and focus on other preventative measures, mainly revolving around killing mosquitoes and avoiding being bitten. Sleeping under a long-lasting insecticide treated bednet is one such method, which is cheap, easy and very effective.

Incidentally, the area you are in is interesting from a malaria point of view since it is one of the few places where transmission of Plasmodium knowlesi occurs. This is a type of malaria which was thought to be only present in macaque monkeys, until human cases started becoming more prevalent a few years ago. Now it is considered a “human” type of malaria, and an emerging threat in south-east Asia. It’s important to be aware of it as the mosquitoes which transmit it tend to be forest-dwelling (since that is where the macaques live), and although very easily treated with chloroquine or other anti-malarials, an infection can progress rapidly into quite severe disease.

If you suspect you might have malaria at any point, therefore, it is crucial to get out and get tested at a clinic or hospital, where they can promptly treat you if you test positive. Be aware also that if tested via microscopy, P. knowlesi can often be confused with P. malariae or P. vivax; while the initial treatment is likely to be the same for all three, if you had P. vivax you might be told about taking an additional medication, called primaquine, to prevent future relapses, whereas relapses do not occur with P. knowlesi.

How is Malaria Prevented?

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QUESTION

What are the methods to prevent malaria?

ANSWER

Malaria prevention consists of a combination of mosquito avoidance measures and chemoprophylaxis. Although very efficacious, none of the recommended interventions are 100% effective.

Mosquito Avoidance Measures

  • Because of the nocturnal feeding habits of Anopheles mosquitoes, malaria transmission occurs primarily between dusk and dawn.
  • Contact with mosquitoes can be reduced by remaining in well-screened areas, using mosquito bed nets (preferably insecticide-treated nets), using a pyrethroid-containing flying-insect spray in living and sleeping areas during evening and nighttime hours, and wearing clothes that cover most of the body.
  • All travelers should use an effective mosquito repellent.
  • The most effective repellent against a wide range of vectors is DEET (N,N-diethylmetatoluamide), an ingredient in many commercially available insect repellents. The actual concentration of DEET varies widely among repellents. DEET formulations as high as 50% are recommended for both adults and children older than 2 months of age (see the Protection Against Mosquitoes, Ticks, and Other Insects and Arthropods section later in this chapter). DEET should be applied to the exposed parts of the skin when mosquitoes are likely to be present.
  • In addition to using a topical insect repellent, a permethrin-containing product may be applied to bed nets and clothing for additional protection against mosquitoes.

Chemoprophylaxis

  • All currently recommended primary chemoprophylaxis regimens involve taking a medicine before travel, during travel, and for a period of time after leaving the malaria endemic area. Beginning the drug before travel allows the antimalarial agent to be in the blood before the traveler is exposed to malaria parasites.
  • Presumptive antirelapse therapy (also known as terminal prophylaxis) uses a medication towards the end of the exposure period (or immediately thereafter) to prevent relapses or delayed-onset clinical presentations of malaria caused by hypnozoites (dormant liver stages) of P. vivax or P. ovale. Because most malarious areas of the world (except the Caribbean) have at least one species of relapsing malaria, travelers to these areas have some risk for acquiring either P. vivax or P. ovale, although the actual risk for an individual traveler is difficult to define. Presumptive anti-relapse therapy is generally indicated only for persons who have had prolonged exposure in malaria-endemic areas (e.g., missionaries, volunteers).
  • In choosing an appropriate chemoprophylactic regimen before travel, the traveler and the health-care provider should consider several factors. The travel itinerary should be reviewed in detail and compared with the information on where malaria transmission occurs within a given country (see the Malaria Risk Information and Prophylaxis, by Country, section later in this chapter) to determine whether the traveler will actually be traveling in a part of the country where malaria occurs and if significant antimalarial drug resistance has been reported in that location.
  • The resistance of P. falciparum to chloroquine has been confirmed in all areas with P. falciparum malaria except the Caribbean, Central America west of the Panama Canal, and some countries in the Middle East. In addition, resistance to sulfadoxine–pyrimethamine (e.g., Fansidar) is widespread in the Amazon River Basin area of South America, much of Southeast Asia, other parts of Asia, and in large parts of Africa. Resistance to mefloquine has been confirmed on the borders of Thailand with Burma (Myanmar) and Cambodia, in the western provinces of Cambodia, in the eastern states of Burma (Myanmar), on the border between Burma and China, along the borders of Laos and Burma, and the adjacent parts of the Thailand–Cambodia border, as well as in southern Vietnam.
  • Additional factors to consider are the patient’s other medical conditions, medications being taken (to assess potential drug–drug interactions), the cost of the medicines, and the potential side effects.
      The medications recommended for chemoprophylaxis of malaria may also be available at overseas destinations. However, combinations of these medications and additional drugs that are not recommended may be commonly prescribed and used in other countries. Travelers should be strongly discouraged from obtaining chemoprophylactic medications while abroad. The quality of these products is not known, and they may not be protective and may be dangerous. These medications may have been produced by substandard manufacturing practices, may be counterfeit, or may contain contaminants. Additional information on this topic can be found in an FDA document

Purchasing Medications Outside the United States

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Community Based Management for Malaria

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QUESTION

what are the methods for community based management for malaria?

ANSWER

Community-based management of malaria revolves around three main principles: prevention, diagnosis and treatment.

Prevention mainly revolves around stopping mosquitoes from biting people. Methods for this include distribution of long-lasting insecticide treated bednets (and teaching people to use them properly!), indoor residual spraying to stop mosquitoes from living in houses, screening houses properly and removing sources of stagnant water from the community to stop mosquitoes from breeding. Collectively, these methods are considered “vector control”. They have benefit for the individuals who practice the methods, as well as collective benefit at the community level from reduced transmission. Within the community, pregnant women and young children, who are most at risk of severe infection, are often targeted for preventive measures. In addition, transmission of malaria from a pregnant mother to her unborn child can be prevented through chemoprophylaxis, administered usually twice during pregnancy, in a process known as intermittent preventive therapy (IPT).

Diagnosis and treatment involves educating people about the symptoms of malaria so that if they suspect they are infected, they know how and where to seek appropriate medical care. The community therefore has to provide a clinic or hospital that is sufficiently equipped to do accurate diagnosis, which requires blood testing. Clinicians should also be able to identify which type of malaria the patient is infected with, since this determines treatment. Identification of the type of malaria is usually done via looking at the blood of the patient under a microscope, a process which requires a significant amount of training. The type of treatment depends on the severity of infection as well as the type of parasite they are infected with.

All of the above interventions depend on sustained investment in community health care, training of local health workers and clinicians and education the community about the transmission of malaria and how this can be interrupted.

Malaria Treatment and Prevention Methods

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QUESTION

I work in Central Africa republic.I was recently diagnosed with malaria (p.falciparum) after a blood test—my 4th attack in 15 months and given Co-Arinate. Two days after completing my dose I went for a 2nd blood test and the trophozoite count was 720/mm3.

The doctor prescribed co-artem and said if I don’t get better he shall transfuse quinine. Whats your comment on the treatment? Do these malaria medications/attacks have a long term effect on ones liver? What prophylaxis should I consider to prevent future attacks.

ANSWER

I will forward your question on to one of the medical professional who advises our website. However, normal procedure after treatment failure or incomplete treatment with one type of anti-malarial medication would be to try another type of medication first; Co-Arinate might not have been an ideal first choice given that many types of malaria around the world are showing signs of resistance to pyrimethamine, the combination drug in Co-Arinate.

Co-Artem would be a better first choice drug, given that there is no convincing evidence for resistance to its combination compound, lumefantrine. Quinine could be a potential next step though I would imagine Co-Artem will be successful—make sure the drugs have not expired and are in their original packaging, as counterfeit medication is a problem in many parts of the world.

Regarding prevention, a key method is to sleep under a long-lasting insecticide treated bednet; make sure it is re-dipped in insecticide every year or so to maintain its efficacy. The mosquitoes which transmit malaria tend to feed at night, and so protecting yourself and your home during the evening, night and early morning is crucial. Maintaining good screens on all windows and doors can be a very effective way of preventing mosquitoes from entering, and in many parts of the world, people spray inside with insecticides to reduce the number of mosquitoes yet further. Wearing long-sleeved clothing at night and in the evenings can also prevent bites.

More broadly speaking, you can try to make sure that stagnant water sources, such as empty containers or barrels, are removed, as mosquitoes require still water to breed. Reducing the presence of stagnant water will therefore reduce mosquito numbers; treating standing water with larvacides or adding fish that eat mosquito larvae can also help.

Relapsing Malaria

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QUESTION

I’m constantly on malaria drugs, fall ill every 2 weeks and always diagnosed with malaria.I’m getting really fed up and need a permanent solution to all of this. I want to live a healthy life and I’m tired of being on malaria drugs. How do I overcome malaria permanently?

ANSWER

It is very unusual to be reinfected so constantly with malaria. First of all, how are you getting diagnosed? You should be getting a blood test, and not relying on symptoms only; the symptoms of malaria are very general and it could be that you are suffering from something else entirely.

The two main methods for accurate diagnosis are blood smear and rapid diagnostic test. The blood smear is used throughout the world, but can sometimes miss light infections (though if you feel sick, your infection is likely heavy enough to be detected by this method). The problem is that it requires a trained technician to take the sample, prepare it properly, and read it thoroughly and accurately. In my experience, many clinics, especially if they are rushed and busy, will not take the time to read a blood slide properly, and will just diagnose malaria without looking. This is really bad!

It is very important to be properly diagnosed, so you can get the correct treatment, and if you don’t have malaria, you can be diagnosed for something else. The second kind of diagnostic is a rapid diagnostic test, or RDT. This looks for antibodies to malaria in your blood, and is very sensitive and quick. In an ideal world, you should try to have both done, to cross-check the results.

The next thing is to check whether you are receiving the correct treatment for the type of malaria that you have (if you are positively diagnosed with malaria). In many parts of the world, malaria has become resistant to some of the main medications used against it. Notably, this is the case in many places with Plasmodium falciparum, the most dangerous kind of malaria, which has become resistant to chloroquine in many parts of the world, to sulfadoxine-pyrimethamine (sold as Fansidar in many places) and also to mefloquine (sold as Lariam) in some places. As such, the World Health Organisation NEVER recommends these treatments be given as first line drugs against P. falciparum malaria—instead, they recommend artemisinin-combination therapies (ACTs), such as Alu, Coartem or Duo-Cotecxin. If you have been diagnosed with P. falciparum, you must try to take these kinds of drugs first. No resistance to ACTs has been reported, so if you take the full dose correctly, as prescribed by your doctor (and check to make sure the drugs are not expired), then you should be cured of malaria.

However, treatment does not stop you from getting infected again, and this is where prevention comes it. Preventing malaria is a cornerstone of control efforts. Since malaria is transmitted by a mosquito, preventing mosquitoes from entering the house, and particularly stopping them from biting you at night, is crucial. Screening all doors and windows can help stop mosquitoes from getting in, and in high transmission areas, many people will also spray inside their houses every once in a while with insecticides to kill any lingering insects.

In addition, sleeping under a long-lasting insecticide treated bednet can drastically reduce the number of mosquitoes that are able to bite you at night. If you already have a net, it may be worth re-dipping it in insecticide (usually permethrin) to make sure it is still working effectively. The mosquitoes that transmit malaria feed at night, so if you are walking around outside in the evenings or at night, it is important to try to wear long-sleeved clothing, to prevent them from accessing your skin.

All of these efforts will help prevent you from getting malaria again in the future.