Alterations in Penicillin-Binding Protein 1A Confer Resistance to Beta-Lactam Antibiotics in Helicobacter Pylori - PubMed
https://pubmed.ncbi.nlm.nih.gov/12069978/Stewardship / Resistance Scan for Feb 24, 2020 | CIDRAP
http://www.cidrap.umn.edu/news-perspective/2020/02/stewardship-resistance-scan-feb-24-2020Your Kid Probably Doesn’t Have a Penicillin Allergy - The New York Times
https://www.nytimes.com/2020/06/22/parenting/penicillin-allergy-kids.html