Vesicular Stomatitis |
1 - Introduction
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Introduction. Vesicular stomatitis virus (VSV) is a rhabdovirus which causes re-emerging disease in cattle, horses and swine. For the past two decades, VSV has caused disease outbreaks in the western US every 2-9 years ('82-83, '85-86, '95, '97-98, '04-'06). Economic impact results in direct loss from decreased animal production (Ellis and Kendall 1964), as well as serious economic losses associated with cancellation of livestock events and quarantines which are lifted 21 days after the last clinical sign has abated. Additional concerns arise from the fact that VS is clinically indistinguishable from foot-and-mouth disease, one of the most devastating exotic diseases in livestock that was eradicated from the US in 1929.
Two antigenically distinct serotypes of VSV, VSV-New Jersey (VSV-NJ) and VSV-Indiana (VSV-IN) cause hundreds to thousands of vesicular disease outbreaks annually in southern Mexico, Central America and in northern South America (Anonymous 1990, Barrera 1992). Outbreaks sweep northward with the movement of animals and/or insect vectors from Mexico through the southwestern US, sometimes reaching as far north as Canada (Rodriguez et al. 2000, Rodriguez 2002, Rainwater-Lovett et al. 2007). VSV infects such a broad variety of hosts that it is not clear that any animal is naturally resistant to infection. Clinical signs are well documented (Tesh et al. 1975) and abate within two weeks if there are no complications such as secondary infections. The disease is rarely fatal, but mastitis, anorexia, dehydration, and weight loss result in significant production losses.
Human infection during epizootics is relatively common and is related to direct contact with infected animals (Fields and Hawkins 1967, Clewley and Bishop 1979, Reif et al. 1987). In the US, human infections are rare (Hanson et al. 1950, Patterson et al. 1958), but typically result from handling infected animals (Brody et al. 1967) or through laboratory infections (Johnson et al. 1966a). To date, there are no reported cases of human infection resulting from the bite of an infected insect.
Recent VS outbreaks. Surveillance is conducted primarily by the State Departments of Agriculture, who report to USDA, APHIS, Veterinary Services. Veterinarians examine all animals for events and for interstate or international movement. Veterinarians and livestock owners must immediately contact State or Federal animal health authorities if a case of VSV is suspected. If virus isolation and serology confirm a VSV diagnosis, animal health officials and the attending veterinarian are notified and a quarantine is placed on the premises. The most recent outbreak (VSV-NJ) occurred from 2004 to 2006 resulting in a total of 13 states, 114 counties, 748 premises, and 1,276 affected animals.
Mechanisms of pathogenesis and infection. Morbidity rates vary greatly, but can be as high as 90%. VS spreads through a herd by direct contact 1-5 days after the initial animal infection (Arbelaez and Valbuena 1987, Howerth et al. 1997, Stallknecht et al. 1999). Virus is shed from oral lesions into saliva (Patterson et al. 1955, Thurmond et al. 1987), contaminating feed, water troughs and other fomites for up to 3-4 days (Hanson 1952, Leder et al. 1983). VSV is infectious by the oral route (Stallknecht et al. 1999) and can be transmitted by blood-feeding insects (Tesh et al. 1975). VSV-NJ has been isolated from potential insect vector species during VS outbreaks, including sand flies, black flies, biting midges, eye gnats, and muscoid flies (Letchworth et al. 1999). Experimentally infected sand flies, black flies, and Culicoides midges have been shown to be competent vectors and transmit virus by feeding on animals (Tesh et al. 1971, Cupp and Cupp 1997, Mead et al. 1997, Mead et al. 1999, Mead et al. 2004, Drolet et al. 2005, Perez De Leon et al. 2006, Perez de Leon and Tabachnick 2006). Interestingly, VSV does not circulate in blood at levels required to infect blood feeding insects (Carbrey, Johnson et al. 1969, Yuill and Steele 1981, Arbelaez 1983, Arbelaez and Valbuena 1987, Orrego et al. 1987, Thurmond et al. 1987, Comer et al. 1995), thus, it is believed that insects become infected while feeding near VS lesions which contain as much as 109 PFU/ml of virus and contaminate the surrounding skin (Patterson et al. 1955, Thurmond et al. 1987).
Diagnosis. VS is diagnosed in suspected animals by virus isolation from vesicular fluid or epithelium, detection of viral antigen by capture ELISA (Alonso et al. 1991, Hernandez De Anda et al. 1992) and immunohistochemistry (Stallknecht et al. 1999), detection of nucleic acid through PCR (Rodriguez et al. 1993, Callens and De Clercq 1999), and detection of virus-specific antibodies with ELISA (Vernon and Webb 1985, Zhou et al. 2001), complement fixation, and virus neutralization (Johnson et al. 1966b).
Treatment, Vaccines, Control. There is no specific treatment or cure for VS. Supportive care (soft feeds, fresh, clean water and electrolyte replacement therapy) can be helpful. Mild antiseptic mouthwashes and antibiotics are often used to treat or prevent secondary infections. Neutralizing antibodies can last eight years in exposed cattle (Sorenson et al. 1958). This protection, however, is questionable as most cattle in VS endemic areas have antibodies capable of neutralizing the virus strain causing their clinical disease (Rodriguez et al. 1990, Vernon et al. 1990, Vanleeuwen et al. 1995), but can be reinfected with that strain as early as 30-60 days (Brandly et al. 1951, Hanson 1952, Vernon et al. 1990, Vanleeuwen et al. 1995). Reinfection, in the presence of strain-specific neutralizing antibodies, makes effective vaccination strategies difficult, thus, more molecular targets to interrupt transmission and infection are needed. Recombinant (Martinez et al. 2004), and inactivated (House et al. 2003) virus vaccines have been experimentally tested, but are not yet available commercially. Several inactivated vaccines are used in Central and South America for animals, but no human vaccines are available. Control of outbreaks is dependent upon rapid recognition of initial cases, quarantine of animals, rigorous disinfection practices (personnel materials, instruments, equipment, vehicles, shared equipment, feed bunks, and water sources) and insect control.
REFERENCES
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