Comment in

• Eat dirt--the hygiene hypothesis and allergic diseases.

  Weiss ST. Weiss ST. N Engl J Med. 2002 Sep 19;347(12):930-1. doi: 10.1056/NEJMe020092. N Engl J Med. 2002. PMID: 12239263 No abstract available.
• Can falling infection rates in one country explain rising incidence of autoimmune and allergic diseases in other countries? Caution when (over) interpreting ecological data from disparate areas.

  Tremlett H, Rodney R, Lucas R. Tremlett H, et al. Mult Scler Relat Disord. 2018 Apr;21:A3-A5. doi: 10.1016/j.msard.2017.11.001. Epub 2017 Nov 3. Mult Scler Relat Disord. 2018. PMID: 29724378 No abstract available.