https://www.sfm-microbiologie.org/wp-content/uploads/2023/07/Recommandations-relatives-aux-indications-du-diagnostic-de-la-COVID-V2_final.pdf 2023 France practice guideline clinical laboratory techniques hospital, nos COVID-19 indicators and reagents environment laboratory diagnosis suggestive of pathology, molecular molecular biology Biological Indicator hospitals indication of health planning guidelines biology laboratory diagnosis