When sanitary arrangements are degraded, lice are likely to quickly expand and the population of lice can increase by 10% per day [33] when the conditions of hygiene are met [29].
Recovery of soft tissue from injuries depends on wound size, location, condition of oral hygiene, and the level of immunity.
In accordance, under similar conditions of oral hygiene and salivary flow, diabetic patients usually present higher incidence of caries than the control subjects [41].
Norovirus genotyping confirmed the worldwide occurrence of different genotypes that lead to outbreaks under conditions of restricted hygiene.
Human biomonitoring can be situated in a tradition of occupational medicine that developed under the conditions of industrial hygiene as an applied science.
It is thus frequently used as a nutritional supplement and is generally regarded as safe when cultivated under conditions of appropriate hygiene.
It has been suggested that this second group could be relatively more important in tropical countries than in other regions [ 1], particularly under conditions of bad hygiene [ 9].
That sheep are maintained under conditions of poor hygiene, without veterinary counsel, and that the bleeding and sale takes place outside may explain how C. burnetii infected particles could have contaminated soil, wool, or loose straw, and particles could have blown downwind.
After all, 100 years earlier everyone in this country would have known a casualty, and not just of war, but of birth, of infancy, of untreatable conditions aggravated by lack of hygiene and unsafe work; death was a regular visitor.
The induction of tolerance by repeated exposition to pathogens is consistent with the hygiene hypothesis [28], [29], according to which the increase in the number of allergies that has been observed these past decades is due to the improvement of hygiene conditions.
