The goal of this interventional study is to learn about nasal microbiome and viral infections in newborns hospitalised in neonatology. The main questions it aims to answer are : * how often are newborns infected by viruses in neonatology ? * how does the microbiome develop during first weeks of life ? * how does microbiome and viruses interacts together ? * is there a link between viral infection, microbiome, and medical complications during hospitalisation in neonatology ? Participants will have a nasal swab taken each week during their hospitalisation in neonatology, and researchers will take medical data from the medical chart.
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Change in microbiome diversity
Timeframe: Day 0, day 7, day 14, and each week until discharge (maximum duration : 3 months for each newborn).
Change in microbiome abundance
Timeframe: Day 0, day 7, day 14, and each week until discharge (maximum duration : 3 months for each newborn).
Virus presence
Timeframe: Day 0, day 7, day 14, and each week until discharge (maximum duration : 3 months for each newborn).