Babesiosis

Babesiosis is an infection caused by intraerythrocytic parasites of the genus Babesia ^[2][1]. The condition is described as zoonotic and tick-transmitted, with human infection occurring despite the much broader range of Babesia species that infect domesticated and wild animals ^[1]. Source-backed detail on formal case definitions or species-specific distinctions is not yet available in the provided material ^[1].

Human babesiosis can present without symptoms or as subclinical infection, but it may also progress to severe, fulminant disease ^[1]. Reported clinical features resemble malaria, and the infection can be fatal in immunocompromised and older patients ^[2]. Because Babesia parasites invade red blood cells, babesiosis may be considered in the context of hemolytic illness, which can manifest with acute or chronic anemia, reticulocytosis, or jaundice ^[3][2]. Source-backed detail on the full symptom spectrum, timing, and complications is not yet available in the provided material ^[2][1].

Human babesiosis is reported throughout the world, indicating a broad geographic distribution, but the incidence is highest in the Northeast and upper Midwestern United States ^[2]. The literature provided frames babesiosis as an emerging tick-borne disease and notes that increasing prevalence and transmission of tick-borne infections are important public-health issues ^[4]. Tick surveillance and tracking are described as useful for identifying areas of risk for transmission, while underdiagnosis makes the overall scope of tick-borne disease difficult to assess ^[4]. Source-backed detail on seasonality, specific reservoir hosts, and local outbreak patterns is not yet available in the provided material ^[2][4].

Transmission occurs primarily through tick exposure ^[2][1]. Less common routes include blood transfusion, and rare routes include transplacental transmission and organ transplantation ^[2]. Source-backed detail on the specific tick species, environmental persistence, or person-to-person spread is not yet available in the provided material ^[2].

The sources specifically identify immunocompromised and older patients as groups in whom babesiosis can be fatal ^[2]. More generally, risk is linked to exposure to ticks and, less commonly, to transfusion or other non-vector routes of infection ^[2]. Source-backed detail on additional occupational, behavioral, or comorbidity-based risk groups is not yet available in the provided material ^[2].

The provided sources emphasize the public-health importance of controlling tick populations and using tick surveillance and tracking to identify areas of transmission risk ^[4]. Awareness of tick-transmitted pathogens in specific locations is also described as important for detection and for selecting appropriate clinical response ^[4]. Source-backed detail on personal protective measures, chemoprophylaxis, or vaccination is not yet available in the provided material ^[4].

In surveillance settings, babesiosis should be read as a tick-borne parasitic infection with a geographically broad but uneven distribution, including higher incidence in the Northeast and upper Midwestern United States ^[2]. The literature indicates that the disease may be underdiagnosed, so observed case counts may underestimate true burden ^[4]. Tick surveillance can help define areas of risk for transmission, while case recognition is informed by the possibility of asymptomatic, mild, or severe disease ^[4][1].

1. 1 Babesiosis. Oxford Medicine Online. 2017. doi: 10.1093/med/9780199937837.003.0164. DOI: https://doi.org/10.1093/med/9780199937837.003.0164
2. 2 Waked R et al. Human Babesiosis. Infect Dis Clin North Am. 2022 Sep. PMID: 36116841. doi: 10.1016/j.idc.2022.02.009. PubMed: https://pubmed.ncbi.nlm.nih.gov/36116841/
3. 3 Madison-Antenucci S et al. Emerging Tick-Borne Diseases. Clin Microbiol Rev. 2020 Mar 18. PMID: 31896541. doi: 10.1128/CMR.00083-18. PubMed: https://pubmed.ncbi.nlm.nih.gov/31896541/
4. 4 Dhaliwal G et al. Hemolytic anemia. Am Fam Physician. 2004 Jun 1. PMID: 15202694. PubMed: https://pubmed.ncbi.nlm.nih.gov/15202694/
5. 5 Babesiosis. Microbial Zoonoses. 2022. doi: 10.1007/978-981-16-7204-0_15. DOI: https://doi.org/10.1007/978-981-16-7204-0_15
6. 6 Babesiosis. Diseases of Cattle in the Tropics. 1981. doi: 10.1007/978-94-015-6895-1_35. DOI: https://doi.org/10.1007/978-94-015-6895-1_35

ICD-10

ICD-11

Total cases

8K

Peak month

2023-07

Coverage

1 reporting countries · 2014-01-18 → 2024-12-28