Influence of Environment on Airsacculitis: Effects of Relative Humidity and Air Temperature on Broilers Infected with Mycoplasma synoviae and Infectious Bronchitis

Abstract

Mycoplasma synoviae (MS) obtained from broiler chickens condemned for airsacculitis was used to determine the influence of air temperature and relative humidity on the severity of airsacculitis produced experimentally. Infectious bronchitis virus was administered to 3-week-old broilers 5 days before aerosol exposure to MS broth cultures, producing extensive airsacculitis within 21-day study periods. High (31-32 C), medium (19-24 C), and low (7-10 C) air temperatures were studied in conjection with high (75-90%), medium (38-56%), and low (23-26%) relative humidities. Airsacculitis was most extensive (45%) at low temperatures regradless of high or medium humidity. The incidence of airsacculitis was greater (39%) at low humidity than at high humidity (17%) when air temperatures were medium. At high temperature, the trend was toward more airsacculitis (12%) at high humidity than (5%) at low humidity. However, the effect of cold air temperature was more dominant than the effect of relative humidity.

Variable lipoprotein haemagglutinin (vlhA) gene sequence typing of mainly DutchMycoplasma synoviaeisolates: comparison withvlhAsequences from Genbank and with amplified fragment length polymorphism analysis

“…M. synoviae strains able to induce airsacculitis, infectious synovitis and eggshell apex abnormalities (EAA) have been described (Olson et al, 1954;Kleven et al, 1972;Morrow et al, 1990a;Landman & Feberwee, 2001;Kang et al, 2002;Feberwee et al, 2009a;Feberwee & Landman, 2010). Moreover, concurrent infections and adverse climate conditions may enhance the severity of clinical signs and lesions induced by M. synoviae (Kleven et al, 1972;Yoder et al, 1977;Hopkins & Yoder, 1982;Landman & Feberwee, 2004;Raviv et al, 2007;Feberwee et al, 2009a). Trade limitations of M. synoviaeinfected flocks free of clinical disease also represent a factor of economic relevance.…”

Aerosol-inducedMycoplasma synoviaearthritis: the synergistic effect of infectious bronchitis virus infection

“…Escherichia coli) that affect the respiratory tract (Kleven et al, 1972;Springer et al, 1974). Adverse climatic conditions in the poultry house can also worsen the airsaculitis induced by M. synoviae (Yoder et al, 1977).…”

Detection of antibodies against Mycoplasma gallisepticum and Mycoplasma synoviae in day-old broiler chicks and broilers

“…Η νόσος του Gumboro, προκαλώντας ανοσοκαταστολή, επηρεάζει δυ σμενώς την εξέλιξη της μόλυνσης από M.s., έχοντας ως α ποτέλεσμα την εμφάνιση σοβαρότερων αλλοιώσεων στους αεροφόρους σάκους, 12 όπως εξάλλου και οι χαμηλές θερ μοκρασίες του περιβάλλοντος. 13 Τόσο το M.g. όσο και το M.s.…”