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Measles virus

Ultrastructural appearance of a single virion of the measles virus, transmission electron microscopy (TEM). The virus is 100-200 nm in diameter, with a core of single-stranded RNA. It causes measles, an infection of the respiratory system. It is very contagious and is spread by coughing, sneezing and close personal contact or contact with infected fluids. Symptoms may include fever, runny nose, cough, red eyes and a generalized rash. Prior to 1963, almost everyone got measles. However, after vaccination became available for the disease, the number of cases dropped by 98 %. Image courtesy of the Centers for Disease Control and Prevention (CDC / Cynthia S. Goldsmith; William Bellini, Ph.D.).

Cladosporium spp.

Common environmental / allergenic mold (Cladosporium spp.); fungal hyphae producing spores. Synonym - Hormodendrum. Magnification 340, scanning electron microscopy. This specimen was found on the inner surface of a buildings air supply duct. This genus is the most common outdoor airborne mold but may occur in homes. It is an allergenic mold producing over 10 different types of antigens. The spores are easily made airborne and are a common cause of respiratory problems. It is frequently found at elevated levels in water-damaged environments. The genus Cladosporium includes over 30 species. The most common ones include Cladosporium elatum, Cladosporium herbarum, Cladosporium sphaerospermum (common indoors), and Cladosporium cladosporioides. Cladosporium can cause mycosis and extrinsic asthma (immediate-typehypersensitivity: type I). Acute symptoms include edema and bronchiospasms, chronic cases may develop pulmonary emphysema. Certain species cause systemic fungal infections and has been documented in cases of blastomycosis, candidiasis, chromoblastomycosis, histoplasmosis, entomophthoromycosis, onychomycosis, sinusitis, pulmonary infections, phaeohyphomycosis and keratomycosis. Cladosporium spp. can also be associated with the spoilage of refrigerated meats. Courtesy of Dennis Kunkel.

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Furthering progress in veterinary virology, as well as education, free exchange of information and to provide an organization for individuals who devote a significant portion of their professional activities to research, teaching or the practical application of veterinary virology.

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