Bovine respiratory syncytial virus seroprevalence and risk factors in endemic dairy cattle herds

Abstract

The herd seroprevalence of bovine respiratory syncytial virus (BRSV) was studied in 59 dairy cattle herds using serology on random selected animals stratified by two age classes (heifers, cows). Risk factors for primary infections in heifers were investigated using a questionnaire on management conditions and data on bovine viral diarrhoea (BVD) status. At least one seropositive cow was present in all the herds. In 25% of the herds all individual were seropositive and 22% of herds had all heifers seronegative. Analysis of the influence of risk factors retained summer pasture and BVD status. In particular, absence of summer pasture and the BVD positive status of heifers were associated with an increased risk of BRSV infection in heifers group.

Bovine respiratory syncytial virus: infection dynamics within and between herds

“…The prevalence estimate is lower than that reported in many other countries (Elvander 1996, Paton and others 1998, Uttenthal and others 2000, Luzzago and others 2010, Ohlson and others 2010) which is probably due to the different methods used to estimate the prevalence. In Sweden, the prevalence based on bulk tank milk has been reported to be between 41 per cent and 89 per cent (Elvander 1996, Ohlson and others 2010) and up to 100 per cent in England and Wales (Paton and others 1998).…”

Detection of Multiple Antibodies and Risk Factor Association of Common Respiratory Viruses in the State of Punjab, India

“…Age was a significant risk factor associated with BRSV with lower prevalence in the animal <1 years of age in Korea (Lee et al, 2000) and 7-8 fold higher odds of seropositivity to BRSV was earlier recorded in older group of animal >4years in Mexico (Solis-Calderon et al, 2007) and in Iran (Shirvani et al, 2012). The present seroprevalence to BRSV increased with increasing animal age is in consonance to the findings of Luzzago et al, (2010) and Bidokhti et al, (2009). Caswell and Williams (2008) opined seroprevalence in adult animals is reported to be 40 to 95% and correlate well with disease protection.…”

Seroepidemiological study of bovine respiratory viruses (BRSV, BoHV-1, PI-3V, BVDV, and BAV-3) in dairy cattle in central region of Iran (Esfahan province)

“…In addition, frequencies of BRSV and BAV-3 in Turkey were more than the frequencies of the two viruses in the present study. There are many factors contributing to differences of seroprevalence of these two viruses in several regions; for example, immunosuppressive stress is induced by factors such as poor nutrition, early weaning, dehydration, low or high temperatures, control of environmental factors, set up of biosecurity; however, even if various diagnostic techniques and a variety of cutoff points have been employed by different investigators, comparison of results is difficult (Brodersen 2010;Luzzago et al 2010). By comparing seroprevalence of five investigated viruses in semi-industrial and industrial farms, positive results were more in the semi-industrial farms rather than in industrial ones.…”