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NASYM, a live intranasal vaccine, protects young calves from bovine respiratory syncytial virus in the presence of maternal antibodies
Author(s) -
Marzo Elena,
Montbrau Carlos,
Moreno MariaCarmen,
Roca Mercè,
Sitjà Marta,
March Ricard,
Gow Sheryl,
Lacoste Stacey,
Ellis John
Publication year - 2021
Publication title -
veterinary record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.261
H-Index - 99
eISSN - 2042-7670
pISSN - 0042-4900
DOI - 10.1002/vetr.83
Subject(s) - nasal administration , viral shedding , vaccination , medicine , antibody , virus , immunology , placebo , respiratory system , immunity , virology , immune system , pathology , alternative medicine
Abstract Background : Bovine respiratory syncytial virus (BRSV) is a major problem for cattle worldwide during their first year of life. The aim of the present study was to evaluate efficacy and longevity of immunity of a live vaccine (NASYM, HIPRA) in the presence of maternally derived antibodies (MDA). Method : Calves (36) were distributed in four groups, based on MDA status and treatment. They received NASYM or a placebo at an early age (less than two weeks) by intranasal route. Eight weeks later, animals were challenged with the Asquith strain of BRSV. Efficacy was assessed by monitoring clinical signs and mortality, PaO 2 , virus shedding and lung lesions. The immunological response was evaluated by measuring IgG in serum and IgA in nasal secretions. Results : A reduction of mortality, lung lesions, shedding and a higher PaO 2 was achieved in NASYM vaccinated groups, independently of MDA status. An anamnestic IgG response was observed after challenge in vaccinated animals, both in MDA+ and MDA‐ groups. An IgA response was also observed in vaccinated animals after vaccination and challenge. Conclusion : NASYM protected newborn calves with MDAs during the first 10 weeks of life, against a very virulent challenge that caused extensive pulmonary lesions and deaths in control animals, with just a single intranasal dose.