The present invention relates to a composition for use in the treatment or prevention of a respiratory infectious
disease in a subject, wherein said composition comprises
blood plasma and immunoglobulins directed against a causative agent of said respiratory infectious
disease, wherein said immunoglobulins are obtained from a donor subject who has developed a humoral immune response to said causative agent of said respiratory infectious
disease; and wherein said composition is administered intranasally, and optionally orally. The present invention further relates to a nasal, naso-oropharyngeal, or oro-
nasal spray device comprising such composition and a nasal, naso-oropharyngeal, or oro-
nasal spray comprising
blood plasma and immunoglobulins directed against a causative agent of said respiratory infectious disease, wherein said immunoglobulins are obtained from a donor subject who has developed a humoral immune response to said causative agent of said respiratory infectious disease.