Sustainable development (2) Labor (2) Time (2) Methodology (2) Belief and doubt (2) Estudio (2) Metodología (2) Creencia y duda (2) Trabajo (2) Tiempo (2) Desarrollo sostenible (2) Respiratory infections (1) Genes (1) Minors (1) Winter (1) Streptococcus pneumoniae (1) Penicillin (1) Months (1) Microbiology--Technique (1) Microbial sensitivity tests (1) Measurement (1) Medicine (1) Identification (1) Finance (1) Erythromycin (1) Economics (1) Antibiotics (1) Aparato respiratorio--Infecciones (1) Microbiología--Técnica (1) Eritromicina (1)