Microglia, of myeloid origin, play fundamental roles in the control of immune responses and the maintenance of central nervous system homeostasis. These cells, just like peripheral macrophages, may be activated into M1 pro-inflammatory or M2 anti-inflammatory phenotypes by appropriate stimuli. Microglia do not respond in isolation, but form part of complex networks of cells influencing each other. This review addresses the complex interaction of microglia with each cell type in the brain: neurons, astrocytes, cerebrovascular endothelial cells, and oligodendrocytes. We also highlight the participation of microglia in the maintenance of homeostasis in the brain, and their roles in the development and progression of age-related neurodegenerative disorders.

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Background Antibiotic resistance is a global health crisis and irrational prescribing behaviour has been identified as a contributing factor. The current study aimed to assess the knowledge of, attitudes towards and practices regarding antibiotic prescribing of medical doctors providing free healthcare services in the outpatient departments of public hospitals in Sierra Leone. In addition, we evaluated prescribing patterns of antibiotics. Methods The study has two parts. First, we conducted a cross-sectional survey using a self-administered questionnaire to assess doctor’s knowledge of, attitudes towards and practices regarding prescribing antibiotics. Second, using patient medical records, we used the World Health Organization methodology on how to assess drug use in health facilities to evaluate prescribing patterns of antibiotics in four selected public hospitals in Sierra Leone. Results Of 130 administered questionnaires, 119 were returned, for a response rate of 91.5%. The majority of doctors (n=83 [69.7%]) agreed that amoxicillin is safe in the first 3 weeks of pregnancy and considered antibiotic resistance a global (n=108 [90.7%]) and national (n=97 [81.5%]) public health crisis. Less than a quarter of medical doctors agreed that antibiotics may speed up the recovery when added to malaria (n=25 [21%]) or cold and cough (n=81 [68%]) therapies. Prescribing pattern results show that children <5 y of age (adjusted odds ratio 5.199 [confidence interval 2.743 to 9.855], p<0.0001) were more likely to be prescribed an antibiotic than pregnant women/lactating mothers. Penicillins were the most commonly prescribed pharmacological class of antibiotics, with amoxicillin being the most commonly prescribed penicillin. Conclusions Doctors demonstrated a sound knowledge of antibiotics and antibiotics resistance, with a positive attitude towards prescribing antibiotics. However, the prescribing pattern of antibiotics was irrational, necessitating the need for the establishment of audit and feedback programmes such as antimicrobial stewardship programmes.

Background The effective implementation of pharmaceutical care requires pharmacists' collaboration with other healthcare providers, especially doctors. However, doctor's perceptions and expectations may not be in line with the tasks and responsibilities of pharmacists. Objectives We aim to explore doctors' expectations and perceptions of pharmacists while working together in a multi-disciplinary team in Sierra Leone. Setting Twelve public hospitals in Sierra Leone. Method A national cross-sectional survey was conducted between July and September 2018. Anonymous self-administered questionnaires were distributed to all doctors at randomly selected public hospitals. Data were analyzed in Excel and SPSS using descriptive and inferential statistics, and a p > 0.05 was taken as statistically significant. Main outcome measure Doctors' perceptions and expectations towards pharmacists role in patient care. Results A total of 119 out of 150 questionnaires were returned. Doctors hold a mixed perception of pharmacists. The majority of medical doctors believed that pharmacists are vital (n = 98; 82.4%) as they provide services that foster better patients outcomes (n = 78; 65.6%). However, about half (n = 58; 48.8%) expressed uncertainty or perceived pharmacists as incompetent in providing clinical pharmacy services. Our findings also showed a large proportion of doctors expect pharmacists to review medication order (n = 110; 92.4%) for appropriateness and monitoring patients' response to therapy and possible adverse drug effects (n = 112; 92.2%). M ore than three quarters (n = 104, 87.4%) were in favour of collaborating with pharmacists in the process of developing patients' treatment plans. Doctors (n = 116; 97.5%) were of the view that doctor-pharmacist collaborations can be improved by developing trust relationships through dialogue. No demographic characteristics were independently associated with doubt in pharmacist clinical competence. Conclusion Reservations regarding pharmacists' clinical competency still prevail amongst medical doctors. Conversely, they view pharmacists as crucial players in the healthcare delivery system in Sierra Leone. Doctors also have high expectations of pharmacists in terms of contributing to better patient outcomes and therefore wish to collaborate. Possible interventions to settle doctors' discontent regarding pharmacists may include fostering interprofessional training, practice, and constructive dialogue. Keywords Free healthcare • Multi-disciplinary team • Pharmaceutical care • Rational drug use • Sierra leone Impacts on practice• Doctors in Sierra Leone perceive pharmacists as essential healthcare service providers that contribute towards better patient outcomes within the health system. • Effective pharmacists-doctors collaboration in patient care is rare in Sierra Leone. Possible contributing fac-

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