Investigation of preventive effect of probiotic nasal spray in incidence of upper respiratory infection Axillary temperature above 38 Celsius degree Exacerbation of Respiratory symptoms Development of gasterointestinal symptoms Abnormality in smell or gestatory senses

Investigation of preventive effect of probiotic nasal spray in incidence of upper respiratory infection Axillary temperature above 38 Celsius degree Exacerbation of Respiratory symptoms Development of gasterointestinal symptoms Abnormality in smell or gestatory senses