Naslov
Clinical and serological survey of avian pneumovirus infection in Croatia

Autori
Lojkić, Ivana ; Biđin, Zdenko ; Pokrić, Biserka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 4th International Symposium on Avian Corona- and Pneumovirus Infections / Heffels-Redman, Ursula ; Kaleta, Erhard F. - Wettenberg : VVB Laufersweiler Verlag, 2004, 263-266

Skup
4th International Symposium on Avian Corona- and Pneumovirus Infections

Mjesto i datum
Rauischholzhausen, Njemačka, 20.06.2004. - 23.06.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
avian pneumovirus; turkeys; antibodies; differential diagnosis

Sažetak
The first avian pneumovirus (APV) outbreak, caused an 18.4% mortality, was observed in Croatia in a broiler flock in 1989. The APV outbreak in the laying turkeys was detected in 1990. About 10% of the birds were affected by a mild form of the disease. A 3-week decrease of the egg production and hatchability was recorded in the period between weeks 5 and 18 of lay. The APV infection in turkeys was monitored systematically in the turkey flocks in the period between 1997 and 2002. Sera samples were randomly collected from female and male breeding and fattening turkeys suspected to be infected with APV. Ten to 20 sera samples were taken from a flock. The turkey age ranged from 1 day to 47 weeks and turkeys were not vaccinated against APV. The levels of APV antibodies were determined by commercially available ELISAs (Avisure, Vetoquinol SA, France). A differential diagnosis including Mycoplasma gallisepticum (MG), Mycoplasma synoviae (MS), Mycoplasma meleagridis (MM), avian influenza virus (AIV) and Newcastle disease virus (NDV) was carried out. In 1997 the presence of antibodies against APV was confirmed in only 1.3% of sera of turkeys with the clinical signs and the pathological findings characteristics for respiratory diseases. Suspected were 2.9% of analyzed sera. An increase of antiAPV positive (13.3%) and suspected (16.7%) sera was detected in 1998. The antiAPV positive rate tended to increase and a considerably higher number of antiAPV positive sera amounting to 90.7% and 4.7% suspected sera was found in 1999. Following the introduction of the rigorous non-specific preventive measures for respiratory disease, 5.6% antiAPV positive and 7.2% suspected sera were detected in 2000. The number of antiAPV (48.3%) and suspected (12.6%) sera increased in 2001. In the period between January and March 2002, 10.9% of analyzed sera were antiAPV positive and 5.0% were suspected. The presence of APV antibodies was identified more frequently in sera of older than younger birds as well as in female rather than in male bird sera. Turkey breeder hens infected by the APV had a drop in egg production accompanied by the decrease of hatchability and the reduction of egg shell quality. In some cases the presence of the antibodies against other avian respiratory pathogens was found. All birds submitted to the serological analysis were vaccinated against NDV and the NDV antibodies in their sera were probably generated by the vaccine.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina

POVEZANOST RADA