Abstract
BACKGROUND: Colombia's climatological variety, added to pathogen diversity, creates local niches for infectious diseases. In Bogotá, respiratory syncytial virus causes 30%-52% of the cases of respiratory infections. In coastal or inter-Andean cities with higher temperature and longer dry seasons, frequency of this virus is 7%-13%. By 2017, increased hospitalizations due to airway infections occurred in regions whose weather is differently influenced by "El Niño Southern Oscillation" than in Bogotá, although microbial diversity might have also been involved. METHODS: For Cali, an inter-Andean city with warm tropical weather, records of respiratory syncytial virus from 2014 to 2018, in children two years old or younger, were analyzed, and genotypes transmitted during 2016-2017 were identified based on partial sequences of glycoprotein G. RESULTS: Most cases of respiratory syncytial virus in Cali occur in the first semesters, with peaks expressed around March-April, without a clear association with pluviosity. Unlike the biannual rotating pattern of Bogotá, co-circulation of types A and B was detected. As years pass, transmission seasons are becoming longer and frequencies of the virus augment. The viral genotypes identified follow international trends with dominance of Ontario and Buenos Aires clades. Similar to other isolates in these clades, viruses from Cali exhibit glycosylation variability that may account for their fitness. CONCLUSIONS: The pattern of respiratory syncytial virus transmission in Cali differs from that in Bogotá. Its epidemiology is shifting and will remain so with the advent of novel respiratory diseases. This may impact the introduction of vaccination schemes for these or other respiratory viruses.