Long term body lice infestation tied to anemia- JAMA

San Francisco: Individuals affected by body lice may be at higher risk of developing anemia, shows a recent study published in the journal JAMA Dermatology. 

The researchers reported that patients with body life infestation had significantly lower mean hemoglobin levels (10.4 g/dL) compared to those without (12.9 g/dL). Also, the proportion of patients with anemia was higher in patients with body lice (70.4%) compared to those without lice (46.9%).

Pediculus humanus humanus (body louse) survives on blood meals and therefore body lice infestation could possibly lead to iron-deficiency anemia. Also, multiple case reports have suggested an association between severe or long-term lice infestation and anemia; however, no epidemiologic studies have not been performed. Risk factors for body lice infestation include lack of access to washing facilities and poor hygiene; which puts specific populations at risk, including individuals with mental illness or physical disability without adequate support, and persons experiencing homelessness. 

Against the above background, Nora Rudd, University of California San Francisco School of Medicine, San Francisco, and colleagues set out to determine the association between body lice infestation and hemoglobin after adjustment for potential confounders.

For this purpose, the researchers performed a retrospective, exposed-unexposed study that featured patients with and without body live. They were matched in a 1:3 ratio on age, sex, and housing status. 

Eligible patients including those hospitalized at the UCSF Moffitt-Long Hospital or Zuckerberg San Francisco General Hospital and received a dermatology consultation between November 1, 2017, and April 30, 2021. Patients with alternate anemia causes were excluded, and the housing status of eligible patients was dichotomized into stable housing and homelessness. 

Mean hemoglobin level at hospital admission was the primary outcome, and the secondary outcome was anemia.

The study included 27 patients with lice and 81 without lice with a mean age of 53.8 years. Among these participants, 20 (18.5%) were women and 92 (85.2%) were homeless. 

Reference:

Rudd N, Zakaria A, Kohn MA, et al. Association of Body Lice Infestation With Hemoglobin Values in Hospitalized Dermatology Patients. JAMA Dermatol. Published online April 20, 2022. doi:10.1001/jamadermatol.2022.0818