Culex or the typical mosquitos are a genus of mosquitoes, several species of which serve as vectors of one or more important diseases of birds, humans, and other animals. The diseases they vector include arbovirus infections such as West Nile virus, Japanese encephalitis, or St. Louis encephalitis, but also filariasis and avian malaria. They occur worldwide except for the extreme northern parts of the temperate zone, and are the most common form of mosquito encountered in some major U.S. cities, such as Los Angeles.
The Western equine encephalomyelitis virus is the causative agent of relatively uncommon viral disease Western equine encephalomyelitis (WEE). An alphavirus of the family Togaviridae, the WEE virus is an arbovirus transmitted by mosquitoes of the genera Culex and Culiseta. WEE is a recombinant virus between two other alphaviruses, an ancestral Sindbis virus-like virus, and an ancestral Eastern equine encephalitis virus-like virus. There have been under 700 confirmed cases in the U.S. since 1964. This virus contains an envelope that is made up of glycoproteins and nucleic acids. The virus is transmitted to people and horses by bites from infected mosquitoes and birds during wet, summer months.
The discipline of medical entomology, or public health entomology, and also veterinary entomology is focused upon insects and arthropods that impact human health. Veterinary entomology is included in this category, because many animal diseases can "jump species" and become a human health threat, for example, bovine encephalitis. Medical entomology also includes scientific research on the behavior, ecology, and epidemiology of arthropod disease vectors, and involves a tremendous outreach to the public, including local and state officials and other stake holders in the interest of public safety.
Culiseta is a genus of mosquitoes. Most Culiseta species are cold-adapted, and only occur in warmer climates during the colder parts of the year or at higher elevations where temperatures are lower. Species found in Southern California are larger than most mosquitoes species, specifically Cs. inornata, Cs. particeps, and Cs. incidens. These species are found throughout the year in Southern California and feed on several vertebrate species, such as birds, livestock, rodents, reptiles, and humans. The larvae of most species are found bogs, marshes, ponds, streams, ditches, and rock pools, but an African species occurs in tree holes ("phytotelmata"), a common eastern Palaearctic species occurs in water wells and rock pools, and several Australian species occur under ground. Little is known about the blood-feeding habits of females. Most species feed on birds and mammals, but a few feed on reptiles. Several species attack domestic animals and occasionally humans, and some species are pollinators.
Culex restuans is a species of mosquito known to occur in Canada, the United States, Mexico, Guatemala, and Honduras. It is a disease vector for St. Louis encephalitis and West Nile virus. In 2013 West Nile Virus positive specimens were collected in Southern California.
Aedes vexans, the inland floodwater mosquito or tomguito, is a cosmopolitan and common pest mosquito. This species has been collected in southern California.
Rocio viral encephalitis is an epidemic flaviviral disease of humans first observed in São Paulo State, Brazil, in 1975. Low-level enzootic transmission is likely continuing in the epidemic zone, and with increased deforestation and population expansion, additional epidemics caused by Rocio virus are highly probable. If migratory species of birds are, or become involved in, the virus transmission cycle, the competency of a wide variety of mosquito species for transmitting Rocio virus experimentally suggest that the virus may become more widely distributed. The encephalitis outbreak in the western hemisphere caused by West Nile virus, a related flavivirus, highlights the potential for arboviruses to cause severe problems far from their source enzootic foci.
Culex quinquefasciatus, commonly known as the southern house mosquito, is a medium-sized mosquito found in tropical and subtropical regions of the world. It is a vector of Wuchereria bancrofti, avian malaria, and arboviruses including St. Louis encephalitis virus, Western equine encephalitis virus, Zika virus and West Nile virus. It is taxonomically regarded as a member of the Culex pipiens species complex. Its genome was sequenced in 2010, and was shown to have 18,883 protein-coding genes.
Hart Park virus, or HP virus, is a single-stranded RNA arbovirus that is primarily transmitted through mosquitoes. The HP virus is classified in the Rhabdoviridae family and is related to the viral agents that cause rabies and vesicular stomatitis. The exact date of discovery of this virus is uncertain, but its presence in the entomological community dates back as far as 1964. Because of its relatively recent discovery, its exact effect on hosts is uncertain. Currently, there is no known disease affiliated with the Hart Park virus.
Culex erythrothorax is a species of mosquito that appears in Southern California. It is also known as the tule mosquito due to its preference for breeding in tule plants. The species has a brownish-orange color. It is a confirmed vector of West Nile virus.
Anopheles freeborni, commonly known as the western malaria mosquito, is a species of mosquito in the family Culicidae. It is typically found in the western United States and Canada. Adults are brown to black, with yellow-brown hairs and gray-brown stripes on the thorax. Their scaly wings have four dark spots, which are less distinct in the male.
Culiseta incidens, the cool weather mosquito, is a species of mosquito in the family Culicidae. Specimens have been collected in Southern California.
Culiseta inornata, the winter marsh mosquito, or the unadorned American cool weather mosquito is a species of mosquito in the family Culicidae. This species is found in southern California.
Anopheles franciscanus is a species of mosquito in the family Culicidae. This species has been collected in southern California.
Lokern virus (LOKV) is a single-stranded, negative sense, tri-segmented RNA virus. It is a subtype of the Bunyamwera virus (BUNV) and closely related to the Main Drain virus (MDV). The virus is a natural reassortment that received its S and L segments from MDV while its M segment shows a relatively low percentage of nucleotide identity in relation to any other orthobunyavirus, suggesting it came from an unknown or extinct virus.
Culex stigmatosoma is a mosquito species that appears in Southern California, Oregon, and Texas. It is a confirmed vector of West Nile virus.
Culex thriambus is a mosquito species that appears in the southwestern United States, including Southern California, Texas, as well as in Mexico. It is a confirmed vector of West Nile virus. The majority of host species the mosquito takes blood from are in the order Passeriformes.
Sister Monica Asman (1920-2016) was an American Catholic nun and research scientist at University of California, Berkeley. She applied genetic methods to mosquitoes with the aim of reducing their ability to carry viruses that can cause disease in humans and animals, and to reduce the size of mosquito populations. She also opened the St. Francis Center of Redwood City for the poor.
Culiseta particeps is a species of mosquito in the family Culicidae. It is found along the West coast of the United States including Southern California, Arizona as well as Mexico and Guatemala. Cs. particeps is not a known vector of human pathogens.
Anopheles hermsi is a species of mosquito in the family Culicidae. It is a known vector of Plasmodium vivax malaria. An. hermsi have been collected in Southern California.
