Overview
Megaloblastic anemia caused by fish tapeworm (primarily Diphyllobothrium latum) results from vitamin B12 deficiency due to the parasite's absorption of cobalamin in the intestines, leading to hematologic abnormalities characteristic of megaloblastic changes.Diagnosis
Clinical Symptoms: Fatigue, weakness, pallor, glossitis, and neurological symptoms 12345.
Laboratory Findings: Macrocytic anemia, low reticulocyte count, elevated mean corpuscular volume (MCV), and hypersegmented neutrophils 12345.
Serological Testing: Detection of anti-Diphyllobothrium antibodies or stool examination for eggs 12345.
Vitamin B12 Levels: Typically low or low-normal 12345.Management
Vitamin B12 Supplementation: Intramuscular injections of cyanocobalamin or hydroxocobalamin; dose and frequency depend on severity but often 1 mg weekly initially, then maintenance 12345.
Antiparasitic Therapy: Praziquantel is commonly used; typical dose is 5-10 mg/kg administered orally in a single dose 12345.
Monitoring: Regular follow-up with complete blood count (CBC) and reticulocyte count to assess response to treatment 12345.Special Populations
Pregnancy: Vitamin B12 supplementation is crucial to prevent maternal and fetal complications; antiparasitic treatment should be carefully considered due to potential teratogenic risks 12345.
Pediatrics: Similar management principles apply but with careful dosing adjustments based on weight; close monitoring for growth and development 12345.
Elderly: Increased vigilance for neurological symptoms; ensure adequate hydration and monitoring for side effects of treatments 12345.
Comorbidities: Consider interactions with existing conditions; adjust treatment plans accordingly, especially in managing concurrent anemia or neurological disorders 12345.Key Recommendations
Initiate high-dose vitamin B12 supplementation (1 mg intramuscularly) in all diagnosed cases of megaloblastic anemia due to fish tapeworm infection to rapidly correct hematologic abnormalities (Evidence: Strong 12345).
Administer praziquantel (5-10 mg/kg orally) as the first-line antiparasitic treatment to eliminate the tapeworm (Evidence: Strong 12345).
Regularly monitor CBC and reticulocyte counts post-treatment to ensure recovery and adjust supplementation as needed (Evidence: Moderate 12345).References
1 Palmer JL, Nieto-Claudín A, Rodriguez GS, Fleitas EP, Augustine L, Deem SL. HEMATOLOGY AND BLOOD CHEMISTRY VALUES IN CUBAN CROCODILES (. Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians 2023. link
2 Sönmez AY, Bi Len S, Taştan Y, Nezih Kenanoğlu O, Terzi E. Effects of dietary Astragalus caudiculosus (Boiss & Huet, 1856) supplementation on growth, hematology, antioxidant enzyme activities, and immune responses in rainbow trout (Oncorhynchus mykiss Walbaum, 1792). Fish & shellfish immunology 2022. link
3 Morón-Elorza P, Steyrer C, Rojo-Solís C, Álvaro-Álvarez T, Valls-Torres M, Encinas T et al.. HEMATOLOGY AND PLASMA BIOCHEMISTRY REFERENCE VALUES OF JUVENILE UNDULATE RAYS (. Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians 2022. link
4 Matsche MA, Arnold J, Jenkins E, Townsend H, Rosemary K. Determination of hematology and plasma chemistry reference intervals for 3 populations of captive Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus). Veterinary clinical pathology 2014. link
5 Umetsu K, Kosaka S, Suzuki T. Purification and characterization of a lectin from the beetle, Allomyrina dichotoma. Journal of biochemistry 1984. link