T. Ryan GregoryExposure to *commensal microbes* is important for early immune system development in young children. Infection with *pathogenic viruses* in infancy can disrupt that and lead to long-term morbidity. The immune system is not like a muscle, and infecting kids with pathogenic viruses weakens rather than strengthens them for the future.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.