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evaluation of the risk of neighbourhood infection of h7n1 highly pathogenic avian influenza in italy using q statistic.exposure to the risk of neighbourhood infection was estimated for the h7n1 highly pathogenic avian influenza (hpai) epidemic that affected northern italy between 1999 and 2000. the two most affected regions (lombardy and veneto) were analyzed and the epidemic was divided into three phases. q statistics were used to evaluate exposure to the risk of neighbourhood infection using two measures. first, a local q statistic (qikt) assessed daily exposure for each farm as a function of the number of nei ...201020451272
risk factors for highly pathogenic h7n1 avian influenza virus infection in poultry during the 1999-2000 epidemic in italy.in 1999-2000, italian poultry production was disrupted by an h7n1 virus subtype epidemic of highly pathogenic avian influenza (hpai). the objectives of the present study were to identify risk factors for infection on poultry farms located in regions that had the highest number of outbreaks (veneto and lombardia) and the impact of pre-emptive culling as a complementary measure for eradicating infection. a cox regression model that included spatial factors, such as the g index, was used. the resul ...200918684649
transmission parameters of highly pathogenic avian influenza (h7n1) among industrial poultry farms in northern italy in 1999-2000.we estimated between-farm transmission parameters of the highly pathogenic avian-influenza (hpai) epidemic that struck the poultry industry of northern italy (including turkeys, layer hens, broilers, gamebirds, and waterfowl) from december 1999 through april 2000. we estimated the average number of susceptible farms that were infected with hpai virus by each infectious farm during a day (beta) with a generalised linear model (glm). the hpai's reproductive ratios (r(h); the average number of new ...200717531332
spatial analysis of the 1999-2000 highly pathogenic avian influenza (h7n1) epidemic in northern italy.the effect of proximity on infected premises was evaluated during the highly pathogenic avian influenza (hpai) epidemic that struck northern italy in 1999-2000 by quantifying the spatial and temporal clustering of cases. the epidemic was caused by an h7n1 subtype of type a influenza virus that originated from a low-pathogenic ai virus that spread among poultry farms in northeastern italy in 1999 and eventually became virulent by mutation. more than 90% of 413 infected premises were located in lo ...200717494598
analysis of the 1999-2000 highly pathogenic avian influenza (h7n1) epidemic in the main poultry-production area in northern italy.we evaluated the effects of risk factors and control policies following the highly pathogenic avian influenza (hpai) epidemic that struck northern italy's poultry industry in the winter of 1999-2000. the epidemic was caused by a type-a influenza virus of the h7n1 subtype, that originated from a low-pathogenic ai virus which spread among poultry farms in northeastern italy in 1999 and eventually became virulent by mutation. most infected premises (ip) were located in the regions of lombardy and v ...200616243405
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