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It is known that HIV (Human Immunodeficiency Virus) infection, which causes AIDS after some latent period, is a dynamic process that can be modeled mathematically. Effects of available anti-viral drugs, which prevent HIV from infecting healthy cells, can also be included in the model. In this paper we illustrate control theory can be applied to a model of(More)
Pertussis or whooping cough has been given many names over the centuries. It was first recognized in the Middle Ages and since then various epidemics have been described. Jules Bordet and Octave Gengou isolated Bordetella pertussis, a causative agent for whooping cough, in Paris more than 100 years ago, which created an excellent opportunity to invent a(More)
Upper respiratory tract infections are usually self-treated with synthetic and herbal over-the-counter products. The aim of the study was to assess the reasons for the purchase of those medications in Poland. We examined 413 adults, aged 18 and over (70.5% of them were women) using a questionnaire. The findings demonstrate that oral synthetic products were(More)
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