
November 14, 2006 - Mzuzu, Malawi
Mosquitoes and Malaria
The transition to the rainy season has begun and has made today a pleasant one. It has been stifling hot for the past few days, but today we have had intermittent thunderstorms, the first we’ve experienced since our July arrival. Last week we experienced our first rain showers. It is nice to have the reduced dust as well. I’d like to say the air is clean, but burning of brush and garbage, as well as the small cook fires refill the air with smoke within hours of a rain.
Patricia is still very tired and while the Malarone seems to have prevented her malaria from being as debilitating as it has been for some people we have known, she never quit her activities and therefore suffering from continuing fatigue. Also she is genetically anemic, so the destruction of millions of red blood cells is not good and may take her longer to recover from.
With the little amount of rain we have had so far, the insect population has grown rapidly. Fortunately, we have screens on our house, although that has only limited control – because we still have many small openings around windows, doors, etc. Mosquitoes are not so easily stopped!
Mosquitoes are not a subject I’ve paid a lot of attention to before arriving in Africa, but I do now. I can see a mosquito flying on the other side of the room and can feel the slightest brush against my skin. We were a little paranoid for a long time, now we live with them, but on constant watch.
Here is what we have learned about mosquitoes and malaria (more than most people want to know):
Malaria infects more than 300 million people per year and kills 1 million (some literature I’ve read says up to 3 million). It is a parasite that is carried by the Anopheles genus mosquito. The microscopic, single cell organisms of the genus Plasmodium that carry malaria in humans is probably among the oldest of human and pre-human parasites (at least 60 million years, with mosquitoes being around at least 35 million years). Of the 3,000 species of mosquitoes only the female anopheles transfers the malaria parasites to humans. She must have a meal of blood before she can lay eggs (the male is a vegetarian who dines on nectars of flowers). Exhalation of carbon dioxide directs the bloodthirsty females to their victims, and moisture, warmth, and aroma points them in to a point of attack. They prefer some excretions over others, so some people may have a greater attractiveness than others. For instance, my cholesterol lowering medication is known to increase their attractiveness to me. Men are more frequently bitten than women.
The mosquito-biting technique that I’ll skip over as too technical is how the malaria is injected. Simply a mosquito dines on someone that has the malaria in their blood and then when it goes on to a healthy person, she injects the malaria as part of the anticoagulant she injects to enable her to dine on that person’s blood. In humans, the parasite’s life cycle invokes the periodic destruction of millions of red corpuscles, provoking waves of fever and debilitating weakness in the human host as the plasmodia circulate freely in the bloodstream for a day or two before taking up residence again in new red corpuscles. There are four different forms, one of which is more virulent than others, Plasmodium falciparum, and can kill, and almost always does in its most severe form, when the parasite invades the brain and causes cerebral malaria.
In the tropics the most common form is this Falciparum, and nearly all children are infected by the time they are 2 years old. It is in this population where most deaths occur, especially among the malnourished and lack adequate medical care. Mosquito netting has been distributed to millions of Africans by international relief organizations. This hungry female mosquito primarily feeds between sundown and sunup with peak feeding around midnight. A mosquito is very tenacious and patient, she will work for hours trying to find a minute hole or opening in mosquito netting.
One of the most unsettling experiences is when you are tucked in under your mosquito netting and then a mosquito buzzes by your ear- it’s enclosed in the netting with you! We now keep our netting in place all day and try hard to slip in quickly. We may spray inside the netting if suspect an entry during the day. Crazy, but when you realize that one lousy little mosquito bite may make you very ill for a week or so, and require a doctor’s visit, or if left too long some folks have to hospitalized. We take our Malarone religiously everyday.
When we have a reason to go out at night we spray our clothes with 99+% Permathrin and spray any exposed skin with 99% Deet. But you can’t live like that all of the time due to the oiliness and odor- don’t think the skin would like it all of the time. It does work- we’ve sat in the computer lab at night (windows are always open in classrooms and offices on campus, with no screens) and have been dive bombed by mosquitoes, but they don’t land on us. Thanks to Sue Gee’s efforts we now have “no pest strips” hanging all around our house, and while mosquito populations are on the rise, we seem to have fewer in the house.
Our several visits down to the lake have probably been our most exposed periods, since mosquito populations are high there. Also the not so refined places we stay have mosquito netting with holes. We don’t know when Pat was bitten, although the folks around here say it was likely 9-14 days previous. However all of the literature says that you may contract malaria and not be aware of it for up to 4 months, so we’ll have to sort out flu versus malaria this winter and focus our doctors accordingly. We plan to get complete checkups (especially lab work) upon our return home.
Mosquitoes and Malaria
The transition to the rainy season has begun and has made today a pleasant one. It has been stifling hot for the past few days, but today we have had intermittent thunderstorms, the first we’ve experienced since our July arrival. Last week we experienced our first rain showers. It is nice to have the reduced dust as well. I’d like to say the air is clean, but burning of brush and garbage, as well as the small cook fires refill the air with smoke within hours of a rain.
Patricia is still very tired and while the Malarone seems to have prevented her malaria from being as debilitating as it has been for some people we have known, she never quit her activities and therefore suffering from continuing fatigue. Also she is genetically anemic, so the destruction of millions of red blood cells is not good and may take her longer to recover from.
With the little amount of rain we have had so far, the insect population has grown rapidly. Fortunately, we have screens on our house, although that has only limited control – because we still have many small openings around windows, doors, etc. Mosquitoes are not so easily stopped!
Mosquitoes are not a subject I’ve paid a lot of attention to before arriving in Africa, but I do now. I can see a mosquito flying on the other side of the room and can feel the slightest brush against my skin. We were a little paranoid for a long time, now we live with them, but on constant watch.
Here is what we have learned about mosquitoes and malaria (more than most people want to know):
Malaria infects more than 300 million people per year and kills 1 million (some literature I’ve read says up to 3 million). It is a parasite that is carried by the Anopheles genus mosquito. The microscopic, single cell organisms of the genus Plasmodium that carry malaria in humans is probably among the oldest of human and pre-human parasites (at least 60 million years, with mosquitoes being around at least 35 million years). Of the 3,000 species of mosquitoes only the female anopheles transfers the malaria parasites to humans. She must have a meal of blood before she can lay eggs (the male is a vegetarian who dines on nectars of flowers). Exhalation of carbon dioxide directs the bloodthirsty females to their victims, and moisture, warmth, and aroma points them in to a point of attack. They prefer some excretions over others, so some people may have a greater attractiveness than others. For instance, my cholesterol lowering medication is known to increase their attractiveness to me. Men are more frequently bitten than women.
The mosquito-biting technique that I’ll skip over as too technical is how the malaria is injected. Simply a mosquito dines on someone that has the malaria in their blood and then when it goes on to a healthy person, she injects the malaria as part of the anticoagulant she injects to enable her to dine on that person’s blood. In humans, the parasite’s life cycle invokes the periodic destruction of millions of red corpuscles, provoking waves of fever and debilitating weakness in the human host as the plasmodia circulate freely in the bloodstream for a day or two before taking up residence again in new red corpuscles. There are four different forms, one of which is more virulent than others, Plasmodium falciparum, and can kill, and almost always does in its most severe form, when the parasite invades the brain and causes cerebral malaria.
In the tropics the most common form is this Falciparum, and nearly all children are infected by the time they are 2 years old. It is in this population where most deaths occur, especially among the malnourished and lack adequate medical care. Mosquito netting has been distributed to millions of Africans by international relief organizations. This hungry female mosquito primarily feeds between sundown and sunup with peak feeding around midnight. A mosquito is very tenacious and patient, she will work for hours trying to find a minute hole or opening in mosquito netting.
One of the most unsettling experiences is when you are tucked in under your mosquito netting and then a mosquito buzzes by your ear- it’s enclosed in the netting with you! We now keep our netting in place all day and try hard to slip in quickly. We may spray inside the netting if suspect an entry during the day. Crazy, but when you realize that one lousy little mosquito bite may make you very ill for a week or so, and require a doctor’s visit, or if left too long some folks have to hospitalized. We take our Malarone religiously everyday.
When we have a reason to go out at night we spray our clothes with 99+% Permathrin and spray any exposed skin with 99% Deet. But you can’t live like that all of the time due to the oiliness and odor- don’t think the skin would like it all of the time. It does work- we’ve sat in the computer lab at night (windows are always open in classrooms and offices on campus, with no screens) and have been dive bombed by mosquitoes, but they don’t land on us. Thanks to Sue Gee’s efforts we now have “no pest strips” hanging all around our house, and while mosquito populations are on the rise, we seem to have fewer in the house.
Our several visits down to the lake have probably been our most exposed periods, since mosquito populations are high there. Also the not so refined places we stay have mosquito netting with holes. We don’t know when Pat was bitten, although the folks around here say it was likely 9-14 days previous. However all of the literature says that you may contract malaria and not be aware of it for up to 4 months, so we’ll have to sort out flu versus malaria this winter and focus our doctors accordingly. We plan to get complete checkups (especially lab work) upon our return home.





