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EM of numerous Chikungunya virus particles, which are composed of a central dense core that is surrounded by a viral envelope. Each virion is approximately 50nm in diameter. Chikungunya virus is transmitted to people by infected female mosquitoes, most commonly, Aedes aegypti and Aedes albopictus, two species which can also transmit other mosquito-borne viruses, including dengue. The most common symptoms of chikungunya virus infection are fever and joint pain. Other symptoms may include headache, muscle pain, joint swelling, or rash. Outbreaks have been reported in countries in the Americas, Africa, Asia, Europe, Indian and Pacific Oceans.
SEM of dengue virus (genus Flavivirus), the cause of dengue fever and dengue hemorrhagic fever, mag. 30,195x (at 24 x 36mm). This enveloped RNA virus possesses cubic capsid symmet ry. It is transmitted via mosquitoes, primarily Aedes aegypti. Symptoms of dengue fever include high fever; severe headache; joint, muscle, and bone pain; rash; and mild bleeding.
A man who contracted chikungunya virus during an epidemic onReunion Island, January 2006. The first symptoms were sever e muscular and joint pain and fever, followed by itching andred urticarial plaques. His feet doubled in size and he was bedridden. Chikungunya is caused by an alphavirus and trans mitted by the Aedes aegypti mosquito. (c) Pierre Marchal
Pathology laboratory blood analysis for chikungunya virus, Reunion Island. An epidemic in January 2006 strained laboratory resources. A viral fever caused by an alphavirus and spread by the Aedes aegypti mosquito, chikungunya (in Makonde) refers to the arthritic stoop that develops. While not fatal,no vaccine exists. (c) William Childeric
Close-up view of the anopheles mosquito.
An adult female mosquito piercing skin with proboscis.
SEM of a mosquito (Anopheles sp.), female, mag. 55x (at 8.3 x 11.7 in.). (c) David Spears
EM of malaria parasites (Plasmodium falciparum) in the late schizont (segmenter) stage, inside a red blood cell after complete division, mag. 2,810x (at 24 x 36 mm). A residual body (center) is left over after division. The red blood cell has lysed and only a ghost cell membrane (no cytoplasm) surrounds the new merozoites, with free merozoites outside.
EM of a malaria parasite (Plasmodium falciparum) in the merozoite stage, invading a red blood cell, mag. 5,840x (at 24 x36 mm). This parasitic protozoan, the cause of malaria, rep roduces asexually in red blood cells, destroying the cell. The plasmodial merozoite contains rhoptries, micronemes, ribosomes, mitochondria, a nucleus, and a trilaminar membrane.
Nigerian boy with an enlarged spleen (splenomegaly) due to chronic malaria. Hyperreactive malarial splenomegaly (HMS) isa common cause of splenomegaly in malaria-endemic regions; it is defined as persistent splenomegaly without demonstrable underlying disease. The spleen is outlined on his abdomen and was later surgically removed.
Nigerian microbiologist looking at a blood smear under the microscope to determine if the patient has malaria plasmodia in the blood.
Illustration of malaria infecting red blood cells.
Scanning electron micrograph of malaria, showing a dendriticcell (center) interacting with several red blood cells infe cted with Plasmodium falciparum, mag. 1000x (at 24 x 36 mm).(c) Pr. David Ferguson
Photomicrograph of cinchonidine in the course of crystallization, polarized light, mag. 15x (at 24 x 36 mm). Circhonidine, chemical formula C19H22N2O, is an alkaloid of the quininegroup. It is found in the bark of red cinchona and is used as an antimalarial. (c) Herve Conge
Photomontage of the anopheles mosquito (Anopheles sp.). Thisgenus is a vector of the malaria parasite.
Photomicrograph of a gametocyte of Plasmodium falciparum, a parasite that causes the most virulent form of malaria, inside a red blood cell, mag. 500x. The gametocyte has a typicalcrescent shape. This parasite and the ensuing illness is sp read via the female Anopheles mosquito.
Photomicrograph of doxycycline hyclate, magnified 35 times. Doxycycline is a broad-spectrum antibiotic derived from tetracycline, which is active against gram-positive and gram-negative pathogens, as well as chronic inflammation, acne, anthrax, dysentery, and malaria.
Photomicrograph of sporozoite malaria parasites on a mosquito. Malaria is an infectious disease that affects humans as well as other animals and is found in tropical and subtropical regions. Symptoms of malaria include fever and headache and in severe cases can progress to coma or death.
Conceptual illustration of immunizations needed for travel to Africa and Southeast Asia, showing a vaccine-filled syringe and a mosquito (a vector for several tropical diseases) superimposed over global map. Recommended immunizations for travelers to these regions include yellow fever, hepatitis B, Japanese encephalitis, and typhoid fever.
A still life of a filled yellow fever vaccine bottle.
Electron micrograph of yellow fever virions, mag. 234,000x. Yellow fever, a viral disease that ranges in severity from an influenza-like syndrome to severe hepatitis or hemorrhagicfever, is found primarily in sub-Saharan Africa and tropica l South America. It can be transmitted by a variety of vectors, including mosquitoes.
Structure of the dengue virus (DENV) (pdb 1k4r) the cause of dengue fever. It is a mosquito-borne single positive-stranded RNA of the family flaviviridae and genus flavivirus.
Macrophotograph of an Asian tiger mosquito (Aedes albopictus), 4x life size (at 24 x 36 mm). The Asian tiger mosquito is an invasive and aggressive species that was introduced to the United States during the mid-1980s. It was first collected in Texas in 1985, apparently having traveled from Asia in a shipment of used tires. These mosquitoes are vicious biters and have been known to transmit disease including dengue fever, yellow fever and other forms of encephalitis. Aedes aegypti and Aedes albopictus mosquitoes are also carriers of the Chikungunya virus, of which there have been reported outbreaks throughout the Americas, Africa, Asia, Europe, Indian and Pacific Oceans.
Macrophotograph of a yellow fever mosquito (Aedes aegypti), biting human skin, 3x life size. The yellow fever mosquito is found in tropical and subtropical areas of the world. This one was photographed in southern Texas. It is a well known vector of yellow fever and dengue fever. Aedes aegypti and Aedes albopictus mosquitoes are also carriers of the Chikungunya virus, of which there have been reported outbreaks throughout the Americas, Africa, Asia, Europe, Indian and Pacific Oceans.
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