Objective:To evaluate and analyze the methodology and quality of recommendations in clinical practice guidelines for frail elderly people.Methods:We systematically searched 4 databases including the PubMed, China National Knowledge Infrastructure (CNKI) , China Biology Medicine Database, Wanfang Data, as well as 5 guideline websites involving Guidelines International Network, Canadian Medical Association Clinical Practice Guideline, Scottish Intercollegiate Guidelines Network, National Institute for Health and Care Excellence, New Zealand Guidelines Group, and supplemented to search Medlive. The Appraisal of Guidelines for Research and EvaluationⅡ (AGREEⅡ) and the Appraisal of Guidelines for Research and Evaluation-Recommendation Excellence (AGREE-REX) were used to evaluate the overall quality of the included guidelines and the quality of the recommendations respectively.Results:A total of 862 documents were retrieved, and 5 guidelines were finally included after screening. Among the overall scoring results of the guideline, there were 4 articles in Grade B and 1 article in Grade C. The average scores of 6 fields in AGREEⅡ were scope and purpose 82.2%, stakeholder involvement 54.5%, rigor of development 38.7%, clarity of presentations 83.3%, applicability 30.8% and independence 21.1%. The average scores of 3 fields in AGREE-REX were clinical applicability 73.3%, values and preferences 20.8%, and implementability 65.0%. The guideline issued by the International Conference on Frailty and Sarcopenia Research in 2019 was of the highest quality.Conclusions:Most of the guidelines come from developed countries in Europe and America, and there are no clinical practice guidelines for frail elderly people in China. The newly released guidelines have improved the quality of the methodology and guideline recommendations, but the four fields of rigor, applicability, editorial independence, values and preferences need to be improved.

Toxoplasma gondii is an obligate intracellular parasite and causes serious harm to human and ani-mal health.In recent years,a large amount of research has been conducted on the immunological mechanism of toxo-plasmosis,especially in the immune privileged regions of the host,such as brain,eyes,and placenta.This review summaries the immunological mechanism required for resistance to toxoplasmosis,which may provide a valuable ref-erence for the diagnosis,treatment,and prevention studies.