PMC:7589163 / 32091-32891 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7589163","sourcedb":"PMC","sourceid":"7589163","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7589163","text":"Since 1997, it has been shown in developing countries, where malnutrition and micronutrient deficiency were more common, that the incidence of pneumonia was higher in children with rickets [124,126,131], and treatment failure was seen more frequently in rachitic children [132]. Similar studies were conducted worldwide, evaluating the circulating levels of vitamin D in children with LRTI and in controls: several studies found that lower vitamin D levels were associated with higher risk of developing an acute respiratory tract infection [125,130,132,133,135,139,144], or were linked to a more severe course of illness [136,142], with more frequent need for oxygen supplementation, ventilation support [134], or increased risk of intensive care unit (ICU) admission and longer hospital stay 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