There is a high level of consistency of observations and/or conclusions between the major public health organizations considered in this report – the World Health Organization, the European Centres for Disease Control, the USA Centers for Disease Control and Prevention and the Canadian Public Health Agency’s National Advisory Committee on Immunization – with respect to the similarity of levels and. [...] of Community Medicines, Surgery and Family Medicine, College of Medicine, Faculty of Health Sciences, University of Manitoba 1990 – present Member of the Canadian Association of Teachers of Community Health 1988 – present Member of the Canadian Public Health Association and the Manitoba Public Health Association 1984 – present Fellow of the Royal College of Surgeons of Canada (General Surgery) 197. [...] The most important are: 1) the volume of virus (from the case) which contacts the surface of the mucous membranes of the respiratory tract of the exposed person (contact); and 2) the immune status of the exposed person (contact). [...] In communicable diseases, the transmission of infection and the course of the disease describes the impact of infection on individuals. [...] It is not clear whether the lack of statistical significance is because of the small magnitude of the difference or the small size of the sample.
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