Unveiling the Zoonotic Significance of Toxocariasis in Humans: The Role of Toxocara canis

Main Article Content

Ali Jahanmahin
Hassan Borji

Abstract

Toxocariasis is a zoonotic disease caused by the parasite Toxocara canis, with significant effects on human health. This article provided a comprehensive overview of the importance of complications of Toxocara canis infection. The introduction highlighted the relevance of zoonotic diseases and introduced toxocariasis as a specific example. The subsequent sections delved into toxocariasis, covering its transmission, lifecycle, host specificity, and primary sources of human infection. The epidemiology section presented the global prevalence and distribution of toxocariasis at 11.1% (95% CI: 10.6–11.7%), emphasizing high-risk groups and geographical factors contributing to illness. Detailed information was provided regarding the clinical manifestations of toxocariasis, including variations in disease severity and potential complications. Symptoms of visceral toxocariasis include fever, fatigue, coughing, wheezing, or abdominal pain. The diagnostic methods include laboratory methods (serological testing and western blot) and molecular techniques (PCR), and clinical methods (chest X-ray and CT scan). The prevention and control section outlined strategies for prevention, highlighting the significance of public health measures and awareness campaigns. The One Health approach has recognized the interconnections between human, animal, and environmental health. It has highlighted the necessity of cooperative actions to prevent the spread of diseases that can be transmitted between animals and humans. Future directions need to highlight ongoing research and advancements, including improved diagnostic tools, targeted therapies, risk assessment, and international collaboration. The conclusion reinforces the importance of understanding and addressing Toxocara canis infection on human health. Adopting a One Health approach and implementing effective prevention, diagnosis, and treatment strategies can reduce the burden of toxocariasis, leading to improved health outcomes for humans and animals.

Article Details

How to Cite
Jahanmahin, A., & Borji, H. (2023). Unveiling the Zoonotic Significance of Toxocariasis in Humans: The Role of Toxocara canis. Small Animal Advances, 2(2), 5–11. https://doi.org/10.58803/saa.v2i2.14
Section
Review Article

References

Lotfalizadeh N, Sadr S, Moghaddam S, Najjar M, Khakshoor A, and Ahmadi Simab P. The innate immunity defense against gastrointestinal nematodes: Vaccine development. Farm Anim Health Nutr. 2022; 1(2): 31-38. Available at: https://fahn.rovedar.com/index.php/FAHN/article/view/10

Düzlü Ö, Inci A, Yıldırım A, Doğanay M, Özbel Y, and Aksoy S. Vector-borne zoonotic diseases in Turkey: Rising threats on public health. Turkiye Parazitol Derg. 2020; 44(3): 168-175. DOI: 10.4274/tpd.galenos.2020.6985

Asouli A, Sadr S, Mohebalian H, and Borji H. Anti-tumor effect of protoscolex hydatid cyst somatic antigen on inhibition cell growth of K562. Acta parasitol. 2023; 68(2): 385-392. DOI: 10.1007/s11686-023-00680-3

Sadr S, Charbgoo A, Borji H, and Hajjafari A. Interactions between innate immunity system and Echinococcus granulosus: Permission for vaccine development. Series Med Sci. 2022; 3(1): 1-18. Available at: https://profdoc.um.ac.ir/articles/a/1092954.pdf

Sadr S, Yousefsani Z, Ahmadi Simab P, Jafari Rahbar Alizadeh A, Lotfalizadeh N, and Borji H. Trichinella spiralis as a potential antitumor agent: An update. World Vet J. 2023; 13(1): 65-74. DOI: 10.54203/scil.2023.wvj7

Li H, Chen Y, Machalaba CC, Tang H, Chmura AA, Fielder MD, et al. Wild animal and zoonotic disease risk management and regulation in China: Examining gaps and one health opportunities in scope, mandates, and monitoring systems. One Health. 2021; 13: 100301. DOI: 10.1016/j.onehlt.2021.100301

Shahrokhi A, Moradpour N, Siahsarvie R, and Borji H. An investigation of potentially zoonotic helminth parasites of allactaga elater in Sarakhs, Iran. J Lab Anim Res. 2022; 1(1): 8-13. Available at: https://jlar.rovedar.com/index.php/JLAR/article/view/7

Nath TC, Eom KS, Choe S, Islam S, Sabuj SS, Saha E, et al. Insights to helminth infections in food and companion animals in Bangladesh: Occurrence and risk profiling. Parasite Epidemiol Control. 2022; 17: e00245. DOI: 10.1016/j.parepi.2022.e00245

Healy SR, Morgan ER, Prada JM, and Betson M. Brain food: Rethinking food-borne toxocariasis. Parasitology. 2022; 149(1): 1-9. DOI: 10.1017/s0031182021001591

Carlin EP, and Tyungu DL. Toxocara: Protecting pets and improving the lives of people. Adv Parasitol. 2020; 109: 3-16. DOI: 10.1016/bs.apar.2020.01.001

Morelli S, Diakou A, Di Cesare A, Colombo M, and Traversa D. Canine and feline parasitology: Analogies, differences, and relevance for human health. Clin Microbiol Rev. 2021; 34(4): e00266-20. DOI: 10.1128/cmr.00266-20

Little SE, Barrett AW, Beall MJ, Bowman DD, Dangoudoubiyam S, Elsemore DA, et al. Coproantigen detection augments diagnosis of common nematode infections in dogs. Top Companion Anim Med. 2019; 35: 42-46. DOI: 10.1053/j.tcam.2019.04.001

Schwartz R, Bidaisee S, Fields PJ, Macpherson ML, and Macpherson CN. The epidemiology and control of Toxocara canis in puppies. Parasite Epidemiol Control. 2022; 16: e00232. DOI: 10.1016/j.parepi.2021.e00232

Duncan KT, Koons NR, Litherland MA, Little SE, and Nagamori Y. Prevalence of intestinal parasites in fecal samples and estimation of parasite contamination from dog parks in central Oklahoma. Vet Parasitol Reg Stud Reports. 2020; 19: 100362. DOI: 10.1016/j.vprsr.2019.100362

Kamani J, Massetti L, Olubade T, Balami JA, Samdi KM, Traub RJ, et al. Canine gastrointestinal parasites as a potential source of zoonotic infections in Nigeria: A nationwide survey. Prev Vet Med. 2021; 192: 105385. DOI: 10.1016/j.prevetmed.2021.105385

Meliou M, Mavridis IN, Pyrgelis ES, and Agapiou E. Toxocariasis of the nervous system. Acta Parasitol. 2020; 65(2): 291-299. DOI: 10.2478/s11686-019-00166-1

Waindok P, Raulf MK, Springer A, and Strube C. The zoonotic dog roundworm Toxocara canis, a worldwide burden of public health. In: Strube C, Mehlhorn H, editors. Dog parasites endangering human health. Parasitology Research Monographs. 2021. p. 5-26. DOI: 10.1007/978-3-030-53230-7_2

Rostami A, Ma G, Wang T, Koehler AV, Hofmann A, Chang BC, et al. Human toxocariasis–A look at a neglected disease through an epidemiological prism. Infect Genet Evol. 2019; 74: 104002. DOI: 10.1016/j.meegid.2019.104002

Rostami A, Riahi SM, Holland CV, Taghipour A, Khalili-Fomeshi M, Fakhri Y, et al. Seroprevalence estimates for toxocariasis in people worldwide: A systematic review and meta-analysis. PLoS Negl Trop Dis. 13(12): e0007809. DOI: 10.1371%2Fjournal.pntd.0007809

Kaul P, Wright I, and Elsheikha H. Soil contamination with Toxocara spp. eggs in public parks in the Midlands. Vet Nurse. 2022; 13(8): 383-391. Available at: https://www.theveterinarynurse.com/research/article/soil-contamination-with-toxocara-spp-eggs-in-public-parks-in-the-midlands

Jaramillo-Hernández DA, Salazar-Garcés LF, Baquero-Parra MM, da Silva-Pinheiro C, and Alcántara-Neves NM. Toxocariasis and Toxocara vaccine: A review. Orinoquia. 2020; 24(2): 79-95. DOI: 10.22579/20112629.631

Jaramillo-Hernández DA, Garcés LFS, Pacheco LGC, Pinheiro CS, and Alcantara-Neves NM. Protective response mediated by immunization with recombinant proteins in a murine model of toxocariasis and canine infection by Toxocara canis. Vaccine. 2022; 40(6): 912-923. DOI: 10.1016/j.vaccine.2021.12.052

Gurler AT, Bolukbas CS, Akcay A, Pekmezci GZ, Acici M, and Umur Ş. Role of cat and dog faeces in the contamination of sand playgrounds in public parks by Toxocara spp. Med Weter. 2020; 76(8): 441-445. Available at: http://www.medycynawet.edu.pl/images/stories/pdf/pdf2020/082020/2020086436.pdf

Haji Mohammadi K, Heidarpour M, Moosavi Z, and Borji H. Histopathological and biochemical evaluation of albendazole in the treatment of infected mice with hydatid cyst. J Lab Anim Res. 2022; 1(1): 1-7. Available at: https://jlar.rovedar.com/index.php/JLAR/article/ view/6

Zheng WB, Zou Y, Elsheikha HM, Liu GH, Hu MH, Wang SL, et al. Serum metabolomic alterations in Beagle dogs experimentally infected with Toxocara canis. Parasit Vectors. 2019; 12: 447. DOI: 10.1186%2Fs13071-019-3703-5

Despommier D. Toxocariasis: Clinical aspects, epidemiology, medical ecology, and molecular aspects. Clin Microbiol Rev. 2003; 16(2): 265-272. DOI: 10.1128/cmr.16.2.265-272.2003

Ma G, Holland CV, Wang T, Hofmann A, Fan CK, Maizels RM, et al. Human toxocariasis. Lancet Infect Dis. 2018; 18(1): e14-e24. DOI: 10.1016/s1473-3099(17)30331-6

Papavasilopoulos V, Pitiriga V, Birbas K, Elefsiniotis J, Bonatsos G, and Tsakris A. Soil contamination by Toxocara canis and human seroprevalence in the Attica region, Greece. Germs. 2018; 8(3): 155-161. DOI: 10.18683/germs.2018.1143

Awadallah MA, and Salem LM. Zoonotic enteric parasites transmitted from dogs in Egypt with special concern to Toxocara canis infection. Vet world. 2015; 8(8): 946-957. DOI: 10.14202%2Fvetworld.2015.946-957

Sowemimo OA, Lee YL, Asaolu SO, Chuang TW, Akinwale OP, Badejoko BO, et al. Seroepidemiological study and associated risk factors of Toxocara canis infection among preschool children in Osun

State, Nigeria. Acta Trop. 2017; 173: 85-89. DOI: 10.1016/j.actatropica.2017.05.030

Eslahi AV, Badri M, Khorshidi A, Majidiani H, Hooshmand E, Hosseini H, et al. Prevalence of Toxocara and Toxascaris infection among human and animals in Iran with meta-analysis approach. BMC Infect Dis. 2020; 20(1): 20. DOI: 10.1186/s12879-020-4759-8

Mizgajska-Wiktor H, Jarosz W, Fogt-Wyrwas R, and Drzewiecka A. Distribution and dynamics of soil contamination with Toxocara canis and Toxocara cati eggs in Poland and prevention measures proposed after 20 years of study. Vet Parasitol. 2017; 234: 1-9. DOI: 10.1016/j.vetpar.2016.12.011

Rodríguez-Caballero A, Martínez-Gordillo MN, Medina-Flores Y, Medina-Escutia ME, Meza-Lucas A, Correa D, et al. Successful capture of Toxocara canis larva antigens from human serum samples. Parasit Vectors. 2015; 8(1): 264. DOI: 10.1186/s13071-015-0875-5

Hajipour N. A survey on the prevalence of Toxocara cati, Toxocara canis and Toxascaris leonina eggs in stray dogs and cats’ faeces in Northwest of Iran: A potential risk for human health. Trop Biomed. 2019; 36(1): 143-151. Available at: https://pubmed.ncbi.nlm.nih.gov/33597434/

Chen J, Liu Q, Liu GH, Zheng WB, Hong SJ, Sugiyama H, et al. Toxocariasis: A silent threat with a progressive public health impact. Infect Dis Poverty. 2018; 7(1): 59. DOI: 10.1186/s40249-018-0437-0

Fakhri Y, Gasser R, Rostami A, Fan C, Ghasemi S, Javanian M, et al. Toxocara eggs in public places worldwide-A systematic review and meta-analysis. Environ Pollut. 2018; 242: 1467-1475. DOI: 10.1016/j.envpol.2018.07.087

Kroten A, Toczylowski K, Kiziewicz B, Oldak E, and Sulik A. Environmental contamination with Toxocara eggs and seroprevalence of toxocariasis in children of northeastern Poland. Parasitol Res. 2016; 115: 205-209. DOI: 10.1007/s00436-015-4736-0

Amissah-Reynolds PK, Monney I, Adowah LM, and Agyemang SO. Prevalence of helminths in dogs and owners’ awareness of zoonotic diseases in Mampong, Ashanti, Ghana. J parasitol Res. 2016; 2016: 1715924. DOI: 10.1155/2016/1715924

Holland C. Knowledge gaps in the epidemiology of Toxocara: The enigma remains. Parasitology. 2017; 144(1): 81-94. DOI: 10.1017/s0031182015001407

Joy A, Chris O, and Godwin N. Toxocariasis and public health: An epidemiological review. Glob J Infect Dis Clin Res. 2017; 3(1): 28-39. DOI: 10.17352/2455-5363.000016

Mughini-Gras L, Harms M, van Pelt W, Pinelli E, and Kortbeek T. Seroepidemiology of human Toxocara and Ascaris infections in the Netherlands. Parasito Res. 2016; 115(10): 3779-3794. DOI: 10.1007/s00436-016-5139-6

Skulinova K, Novak J, Kasny M, and Kolarova L. Seroprevalence of larval toxocarosis in the Czech Republic. Acta Parasitol. 2020; 65(1): 68-76. DOI: 10.2478/s11686-019-00121-0

Penakalapati G, Swarthout J, Delahoy MJ, McAliley L, Wodnik B, Levy K, et al. Exposure to animal feces and human health: A systematic review and proposed research priorities. Environ Sci Technol. 2017; 51(20): 11537-11552. DOI: 10.1021/acs.est.7b02811

Simonato G, Danesi P, Frangipane di Regalbono A, Dotto G, Tessarin C, Pietrobelli M, et al. Surveillance of zoonotic parasites in animals involved in animal-assisted interventions (AAIs). Int J Environ Res Public Health. 2020; 17(21): 7914. DOI: 10.3390%2Fijerph17217914

Abou-El-Naga IF. Developmental stages and viability of Toxocara canis eggs outside the host. Biomédica. 2018; 38(2): 189-197. DOI: 10.7705/biomedica.v38i0.3684

Etewa SE, Abdel-Rahman SA, Abd El-Aal NF, Fathy GM, El-Shafey MA, and Ewis A. Geohelminths distribution as affected by soil properties, physicochemical factors and climate in Sharkyia governorate Egypt. J Parasit Dis. 2016; 40(2): 496-504. DOI: 10.1007%2Fs12639-014-0532-5

Farmer A, Beltran T, and Choi YS. Prevalence of Toxocara species infection in the US: Results from the national health and nutrition examination survey, 2011-2014. PLoS Negl Trop Dis. 2017; 11(7): e0005818. DOI: 10.1371%2Fjournal.pntd.0005818

Antolová D, Jarčuška P, Janičko M, Madarasová-Gecková A, Halánová M, Čisláková L, et al. Seroprevalence of human Toxocara infections in the Roma and non-Roma populations of Eastern Slovakia: A cross-sectional study. Epidemiol Infect. 2015; 143(10): 2249-258. DOI: 10.1017/s095026881400366

Tyungu DL, McCormick D, Lau CL, Chang M, Murphy JR, Hotez PJ, et al. Toxocara species environmental contamination of public spaces in New York City. PLoS Negl Trop Dis. 2020; 14(5): e0008249. DOI: 10.1371/journal.pntd.0008249

Ketzis JK, and Lucio-Forster A. Toxocara canis and Toxocara cati in domestic dogs and cats in the United States, Mexico, Central America and the Caribbean: A review. Adv Parasitol. 2020; 109: 655-714. DOI: 10.1016/bs.apar.2020.01.027

Ma G, Rostami A, Wang T, Hofmann A, Hotez PJ, and Gasser RB. Global and regional seroprevalence estimates for human toxocariasis: A call for action. Adv Parasitol. 2020; 109: 275-290. DOI: 10.1016/bs.apar.2020.01.011

Qaemifar N, Borji H, and Adhami G. The antiparasitic properties of allium sativum: Can it be used as a complementary treatment for echinococcosis?. J Lab Anim Res. 2023; 2(1): 1-5. Available at: https://jlar.rovedar.com/index.php/JLAR/article/view/14

Weller PF, and Leder K. Toxocariasis: Visceral and ocular larva migrans. Available at: https://www.uptodate.com/contents/toxocariasis-visceral-and-ocular-larva-migrans

Iddawela D, Ehambaram K, Atapattu D, Pethiyagoda K, and Bandara L. Frequency of toxocariasis among patients clinically suspected to have visceral toxocariasis: A retrospective descriptive study in Sri Lanka. J Parasitol Res. 2017; 2017: 4368659. DOI: 10.1155%2F2017%2F4368659

Kuenzli E, Neumayr A, Chaney M, and Blum J. Toxocariasis-associated cardiac diseases—A systematic review of the literature. Acta trop. 2016; 154: 107-120. DOI: 10.1016/j.actatropica.2015.11.003

Maciag L, Morgan ER, and Holland C. Toxocara: Time to let cati out of the bag. Trends parasitol. 2022; 38(4): 280-289. DOI: 10.1016/j.pt.2021.12.006

Ha KH, Song JE, Kim BS, and Lee CH. Clinical characteristics and progression of liver abscess caused by Toxocara. World J Hepatol. 2016; 8(18): 757-761. DOI: 10.4254%2Fwjh.v8.i18.757

Axelerad AD, Stroe AZ, Gogu AE, Pusztai A, Jianu DC, Daniel D, et al. Clinical spectrum of symptoms in cerebral Toxocariasis. Exp Ther Med. 2021; 21(5): 521. DOI: 10.3892%2/etm.2021.9953

Fan CK, Holland CV, Loxton K, and Barghouth U. Cerebral toxocariasis: Silent progression to neurodegenerative disorders?. Clin Microbiol Rev. 2015; 28(3): 663-686. DOI: 10.1128%2FCMR.00106-14

Raulf MK, Jordan D, Auer H, Warnecke JM, Lepenies B, and Strube C. A new ELISA and western blot technique based on recombinant TES antigen and/or larval antigen for the detection of toxocariasis in humans. Parasitology. 2021; 148(3): 333-340. DOI: 10.1017/s0031182020002085

Zibaei M, Sadjjadi SM, Sarkari B, and Uga S. Evaluation of Toxocara cati excretory–secretory larval antigens in serodiagnosis of human toxocariasis. J Clin Lab Anal. 2016; 30(3): 248-253. DOI: 10.1002%2Fjcla.21844

Mazur-Melewska K, Mania A, Sluzewski W, and Figlerowicz M. Clinical pathology of larval toxocariasis. Adv Parasitol. 2020; 109: 153-163. DOI: 10.1016/bs.apar.2020.01.004

Garcia LS, and Procop GW. Diagnostic medical parasitology. Manual of commercial methods in clinical microbiology. John Wiley & Sons; 2016. p. 284-308.

Mazur-Melewska K, Jonczyk-Potoczna K, Kemnitz P, Mania A, Figlerowicz M, and Służewski W. Pulmonary presentation of Toxocara sp. infection in children. Pneumonol Alergol Pol. 2015; 83(4): 250-255. DOI: 10.5603/piap.a2015.0043

Dietrich CF, Cretu C, and Dong Y. Imaging of toxocariasis. Adv Parasitol. 2020; 109: 165-187. DOI: 10.1016/bs.apar.2020.03.001

Bowman DD. Ascaris and Toxocara as foodborne and waterborne pathogens. Res Vet Sci. 2021; 135: 1-7. DOI: 10.1016/j.rvsc.2020.12.017

Graeff-Teixeira C, Morassutti AL, and Kazacos KR. Update on baylisascariasis, a highly pathogenic zoonotic infection. Clin Microbiol Rev. 2016; 29(2): 375-399. DOI: 10.1128%2FCMR.00044-15

Conde MDP, Portugaliza HP, and Lañada EB. Prevalence of Toxocara canis infection in dogs and Toxocara egg environmental contamination in Baybay City, Leyte, Philippines. J Parasit Dis. 2022; 46(4): 1021-1027. DOI: 10.1007/s12639-022-01525-y

Abbasi AM and Eftekhari Hasan Abad MR. The role of mesenchymal stem cell therapy in echinococcus granulosus treatment: A prospective review. J Lab Anim Rese, 2023; 2(2): 6-10. Available at: https://jlar.rovedar.com/index.php/JLAR/article/view/15

Massei G, Fooks A, Horton DL, Callaby R, Sharma K, Dhakal I, et al. Free‐roaming dogs in Nepal: Demographics, health and public knowledge, attitudes and practices. Zoonoses Public Health. 2017; 64(1): 29-40. DOI: 10.1111/zph.12280

Gyang PV, Akinwale OP, Lee YL, Chuang TW, Orok AB, Ajibaye O, et al. Seroprevalence, disease awareness, and risk factors for Toxocara canis infection among primary schoolchildren in Makoko, an urban slum community in Nigeria. Acta Trop. 2015; 146: 135-140. DOI: 10.1016/j.actatropica.2015.03.018

Sharma R, Singh B, and Gill J. Larva migrans in India: Veterinary and public health perspectives. J Parasit Dis. 39(4): 604-612. DOI: 10.1007/s12639-013-0402-6