If you live or have ever lived in the tropics you probably would have encountered a ragingly buzzing winged insect – the mosquito - especially when it gets dark in the room. Sometimes you would swat them and when you don’t, bite you. Mosquitoes are known to cause nasty bites which may result to serious illnesses.
Mosquitoes are the disease burdens of the world population and according to the American Mosquito Control Association (AMCA), over one million people worldwide die from mosquito-borne diseases every year. Mosquito bites can cause severe skin irritation and untold suffering to people in form of red bumps on skin as a result of allergic reactions of the skin with the insects’s saliva. Mosquitoes do not only cause suffering to humans but to animals as well. They transmit diseases to pets like cats, dogs and horses. Mosquitoes cause dog heartworm in cats and dogs and the West Nile virus (WNV) that affects birds and horses too. It is advisable to contact the doctor is a mosquito bite is associated with a more serious warning signs like headache, fever, and body aches.
The World Health Organization (WHO) has raised a global alarm and launched surveillance on the outbreaks of Zika virus in Brazil, north America and parts of Africa as well as the Yellow Fever outbreak in Angola, causing fear and travel restrictions to people. Mosquitoes transmit protozoan, viral and filarial diseases to both humans and animals. They vector diseases like Malaria, yellow fever, Zika virus, Chikungunya, West Nile virus, Dog Heartworm and Dengue fever.
A mosquito’s life span varies from region to region. On average, they live for two to three months but may be active all year-round in the tropics where it is warmer. Meaning most of the mosquito-disease burden in the tropical zone is higher than that of the rest of the world since these insects are active and cause harm for a longer period of time in a year. The most prudent way to prevent illnesses mosquitoes spread is to avoid their bites by wearing light-colored clothing to cover up, sleeping under treated nets, applying a mosquito repellant on your skin, and by keep water in pools and landscaping moving to counter their breeding grounds.
Zika Virus Disease
Zika Virus Disease is caused by a virus transmitted by Aedes aegypti mosquitoes. People with Zika virus can have symptoms which last between 2-7 days and which include mild fever, skin rash, conjunctivitis, muscle and joint pain and headache. There is no specific treatment or vaccine available to combat Zika. The best form of prevention from Zika is protection from mosquito bites. It is endemic in Americas, Africa, Asia and the Pacific. Recent research by the World Health organization (WHO) on Zika virus has linked it to the occurrence of fetal malfunctions and neurological disorders by having babies born with microcephaly in Brazil.
Yellow Fever
Yellow fever is an acute viral hemorrhagic disease transmitted by the aedes and haemogogus mosquitoes, endemic in tropical areas of Africa and Latin America. The virus incubates in the body for 3 to 6 days followed by infection which is characterized by fever, muscle pain, backaches, headache. Loss of appetite, shivers, nausea and vomiting. High level yellow fever causes severe symptoms like high fever, jaundice and bleeding, liver and liver failure and may be fatal. There is no specific treatment for yellow fever, doctors treat people infected symptomatically though the preventive vaccine works well by providing a life-long protection.
Malaria
Malaria is caused by a parasitic protozoan belonging to the plasmodium type transmitted by ab infected female Anopheles mosquito. It is the oldest known mosquito-borne illness that causes more than 600, 000 deaths worldwide annually. A malarial infection is characterized by shaking chills, high fever, profuse swearing, headache, nausea, vomiting, diarrhea, muscle pain, convulsions and coma. Malaria can be treated with the help of anti-malarial drugs, even when one is travelling. Researchers are working on a vaccine.
Chikungunya
Chikungunya is a viral disease transmitted to humans by the Asian Tiger (Aedes albopictus) and the Yellow Fever Mosquito (Aedes aegypti). The primary symptom is excruciating joint pain. It is rarely fatal though the symptoms may persist for weeks. The primary treatment is limited to pain medication for the comfort of the patient as there is no vaccine yet. The disease occurs in Asia, America, Africa and the Indian subcontinent.
Dog Heartworm (Dirofilaria immitis)
Dog heartworm (Dirofilaria immitis) is a serious and potentially fatal mosquito-borne disease affecting dogs. The disease is caused by a roundworm. A mosquito carrying the larvae of the worm through a bite and infect dogs, cats and foxes – and live in the heart and lungs causing multiple organ failure. Sometimes mosquitoes infected with the worm may bite humans but human are the ‘dead-end hosts as thy cannot develop clinical illness from Dog Heartworm infection.
Dengue
Dengue is a virus disease caused by a bite by both the Aedes aegypti and Aedes albopictus types of mosquitoes, in the Americas, Asia and Africa. Dengue symptoms are mild and can be mistaken for those of a common cold and flu though it can develop a more serious condition with high fever and bleeding in the nose and gum or easy bruising, what is referred to as the Dengue hemorrhagic fever.
West Nile virus (WNV)
West Nile virus (WNV) is a mosquito-borne flavivirus type of disease, that is cycled between birds and mosquitoes and transmitted to mammals (including horses) and man by infected mosquitoes. West Nile Fever can be characterized by fever, headache, tiredness and aches or a rash. A vaccine has been developed for horses and symptomatic and supportive treatment is offered as there is no vaccine yet for humans.
It is advisable as a traveler to be vaccinated against diseases that may be prevalent in the areas of your expedition itinerary to avoid infection or transferring illnesses back home. It is also advisable to avoid mosquito bites and destroy their breeding grounds around our homes.
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