[On testing the efficiency of foot-and-mouth disease hyperimmune serum in guinea pigs by injecting myotropic foot-and-mouth disease virus strains].
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Foot and mouth disease (FMD) has devastated animal husbandry in The Netherlands frequently in the past and still constitutes a threat. The use of vaccination reduced the number of outbreaks in The Netherlands in the 20th Century. However, the desire of some member states of the European Community not to use vaccination led to a new strategy based on stamping-out of infected and contagious farms and to strict transportation regulations. In 2001, this proved very disruptive to the wider rural economy, such as the recreational and tourism sectors. The policy also caused severe animal welfare problems and psychological problems among farmers and their families. This raised questions about the wider, and not only veterinary or agricultural, implications of control strategies of foot and mouth disease virus (FMDV). The technology seems to be in place for a return to the use of protective vaccination against FMDV during an outbreak, provided the Office International des Epizooties (OIE: World organisation for animal health) and European Commission (EC) receive data that substantiate the reliability of differentiating tests such as the 3ABC enzyme-linked immunosorbent assay (ELISA) for use in individual animals. Research is in progress but may not be able to produce these data until 2003 or 2004. High potency vaccines should be used to elicit sufficient immunity within three to four days. During an FMD crisis, farmers should be assisted to find markets for products from areas affected by FMDV. The human dimension of any FMD outbreak must be dealt with sufficiently in any contingency plan.
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The atmospheric dispersion of virus was simulated using a computer model which had been developed for predicting the dispersion of toxic gases from chemical engineering plants. The results were compared with data from four outbreaks in which virus was believed to have been transported by air: two outbreaks of foot-and-mouth disease in the United Kingdom in 1967 and outbreaks of Aujeszky's disease in Yorkshire in 1981 to 1982 and Indiana in 1988. There was relatively good agreement with most of these data. The paper shows that the model could be useful in an emergency because the risk of virus spread could be predicted in real time.
Hand, foot, and mouth disease, also known as vesicular stomatitis with exanthem, is a vesicular disorder affecting both skin and oral mucosa. The disease is usually caused by Coxsackie virus A-16 and affects mainly children. The oral lesions may require differential diagnosis from other conditions, such as herpetic gingivostomatitis, aphthous stomatitis, and herpangina. Hand, foot, and mouth disease should not be confused with foot-and-mouth disease of cattle, which is rare in human beings and is not caused by Coxsackie virus.
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Earlier we found that the immune response and antiviral protection from FMDV can be achieved by immunization with uncoupled FMDV peptides. In a search of approaches to animal protection from FMDV A22 strain we prepared a series of peptides corresponding to the putative antigenic determinants. Synthetic 131-149 and 140-149 sequences afforded 50 to 80% protection, both in the free state and conjugated with keyhole limpet hemocyanin. We believe that the 140-149 segment is so far the smallest peptide capable of eliciting specific antiviral protection without conjugation with a high molecular carrier.