Abstract
Tick-borne diseases constitute a group of unique infections with a gradually expanding geographical spread, extremely diverse, often uncharacteristic clinical expression and increasing pathogenicity for humans. Due to the promotion of an active lifestyle associated with tourist and recreational activities in the natural environment, often in forested areas, regions of lush meadows and wild pastures, the risk of accidental transmission of tick-borne pathogens to the human body is significantly increasing. On the other hand, prolonged life expectancy, often accompanying chronic diseases that reduce the efficiency of the immune system, as well as widely used immunosuppressive or immunomodulatory therapies are factors that significantly increase the risk of developing more severe symptoms and long-term clinical consequences of these rarely suspected infections. Anaplasmosis Etiological factor Human granulocytic anaplasmosis (HGA), formerly called granulocytic ehrlichiosis, is an infectious disease caused by microorganisms of the species Anaplasma phagocytophilum (formerly Ehrlichia phagocytophilum). These are Gram-negative bacteria, obligatory intracellular parasites, showing tropism to human neutrophilic granulocytes. Development cycle This disease can develop both in humans and animals. Infections have been recorded in numerous species of domestic and wild animals. Fatal cases have been observed among sheep, cattle, reindeer, deer, moose, dogs, and humans. The most common cause of HGA is a tick bite from the genus Ixodes. In Poland and Europe, this is usually I. ricinus. The presence of A. phagocytophilum has also been confirmed in other tick species occurring in Europe, such as I. hexagonus, I. trianguliceps, and I. persulcatus. Bacterial strains pathogenic to humans can be transmitted by ticks through transmission from horses, dogs, some species of ruminants, hedgehogs, foxes, or wild boars. Infection can also occur transplacentally, through blood transfusion from an infected person, or contact with meat of infected animals – however, these cases are sporadically recorded. Epidemiology Endemic areas of HGA worldwide include the northeastern and north-central parts of the United States and California. The first case in Europe was registered in Slovenia in 1995. HGA incidence is seasonal; most cases are recorded from April to October, related to atmospheric conditions favorable to infections. People living in rural areas, hunters, foresters, farmers, and those practicing outdoor sports are at particular risk. In Europe, HGA occurs much less frequently than in the USA. This is not due to differences in the occurrence of A. phagocytophilum among Ixodes ticks – in both cases it is about 3%. Approximately 300 cases of HGA in humans have been reported in Europe so far. This is relatively few considering the widespread presence of the pathogen in ticks and animals, as HGA is the most common tick-borne disease in Europe. This may be due to the often asymptomatic course of HGA. Cases are frequently reported in Austria, Belgium, Croatia, Czech Republic, France, the Netherlands, Germany, Norway, Portugal, Poland, Slovakia, Slovenia, Switzerland, Sweden, the United Kingdom, and Italy. Studies in Poland show the presence of antibodies indicating past HGA infection in 2–5% of healthy blood donors. In western Norway, this was found in 16% of similar blood samples. In Belgium, the value ranges from 14–17%, while in Switzerland it is only 1.13%. Tests for specific antibodies indicating past HGA infection are not routinely performed among donors.
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