Calidad de la evidencia 4.63/5
Puntuación de revisión en ocho dimensiones según la rúbrica de calidad . Cada dimensión puntuada de 1 a 5.
- D1 Anclaje en las fuentes
- 4/5
- D2 Autoridad de las fuentes
- 5/5
- D3 Aritmética
- 4/5
- D4 Incertidumbre
- 4/5
- D5 Alcance
- 5/5
- D6 Prosa
- 5/5
- D7 Honestidad sobre la percepción
- 5/5
- D8 Completitud de las advertencias
- 5/5
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Percibido
La ansiedad por los parásitos de mascotas tiende a agruparse en dos bandos. Los padres primerizos descubren que perros y gatos albergan áscaris y anquilostomas y concluyen que la mascota familiar es un peligro biológico andante; los propietarios veteranos, entretanto, descartan toda la categoría como una venta veterinaria. Ninguno de los dos bandos tiene una idea clara de las cifras reales. Las enfermedades implicadas —toxocariasis, toxoplasmosis, larva migrans cutánea— son genuinamente comunes en la serología a nivel poblacional, pero rara vez producen una enfermedad clínica dramática en adultos inmunocompetentes, parte de la razón por la que pasan desapercibidas para el público. Los CDC clasifican la toxocariasis como una de las cinco infecciones parasitarias desatendidas en Estados Unidos, una etiqueta que por definición significa a la vez «generalizada» y «poco reconocida».
Estimación aproximada: los propietarios de mascotas tienden a adivinar ~0 % o ~20 %; la verdad está en un punto intermedio
Fuente: intuición editorial, sin encuesta
Real
~5,1 % de seroprevalencia de Toxocara spp. entre personas de EE. UU. de ≥6 años (NHANES 2011-2014)
residentes de EE. UU. de ≥6 años, representativo a nivel nacional (NHANES 2011-2014)
Mostrar cálculo
La seroprevalencia transversal del 5,1 % de anticuerpos contra Toxocara de NHANES 2011-2014 se usa directamente como estimación de exposición a lo largo de la vida, ya que los anticuerpos IgG contra Toxocara persisten durante años y un resultado positivo en una muestra representativa de la población aproxima la exposición acumulada de por vida a través de la distribución de edad estudiada. Es un límite inferior conservador: NHANES III (1988-1994) encontró un 13,9 % de seroprevalencia con métodos de ensayo más antiguos, y los subgrupos que viven por debajo del umbral de pobreza muestran un 10,2 %. La cifra capta solo Toxocara; añadir la toxoplasmosis (~9-11 % de seroprevalencia, NHANES 1999-2004) y el anquilostoma zoonótico (larva migrans cutánea, sin seroprevalencia nacional fiable) elevaría sustancialmente la tasa combinada de exposición de por vida a parásitos zoonóticos de mascotas, pero Toxocara es el parásito específico de mascotas mejor medido y se usa como cifra principal. No todos los individuos seropositivos tuvieron enfermedad clínica —la mayoría de las infecciones son subclínicas.
Riesgos relacionados
Otros riesgos sobre temas similares — para explorar miedos relacionados.
Toxoplasmosis por arenero de gato
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Alergia alimentaria en adultos
¿Cuáles son las probabilidades de desarrollar una alergia alimentaria en la adultez?
Contaminación del aire
¿Cuáles son las probabilidades de morir prematuramente por la contaminación del aire?
Dependencia a benzodiacepinas
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Trastorno bipolar
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Elige el contrincante
About one in twenty Americans carries antibodies to Toxocara, the roundworm genus shed by dogs and cats, according to the most recent nationally representative serology (NHANES 2011–2014). An older survey cycle put the figure closer to one in seven. Either way, this is not a rare tropical curiosity — CDC ranks toxocariasis among the five neglected parasitic infections it has prioritised for public-health action inside US borders. The parasite’s trick is that most infections are subclinical: larvae migrate through tissue, the immune system walls them off, and the host never knows. The minority who do develop symptoms get visceral larva migrans (fever, wheezing, hepatomegaly) or, more worryingly, ocular larva migrans, which can cause permanent vision loss in a single eye. Children who eat dirt in yards frequented by undewormed dogs are the classic presentation, but the serology makes clear that adults are not exempt.
Toxocara is only the headliner. Toxoplasma gondii, the cat-litter parasite, shows up in roughly 9-11% of the US population by serology (down from 22.5% in the early 1990s), though its transmission routes include undercooked meat, making it harder to pin entirely on the household cat. Zoonotic hookworm (Ancylostoma spp.) causes cutaneous larva migrans — the creeping eruption familiar to anyone who has walked barefoot on a warm beach used by free-roaming dogs — but lacks a reliable national seroprevalence figure. Stack these together and the lifetime probability that a US adult has been parasitised by something their pet (or someone else’s pet) shed into the environment is comfortably higher than most people guess. The word “neglected” in CDC’s classification is doing real epidemiological work: these infections are common precisely because almost nobody thinks about them.
The good news, such as it is, sits in the veterinary aisle. Regular deworming of dogs and cats with broad-spectrum anthelmintics slashes the environmental egg burden, and the secular decline in Toxocara seroprevalence between NHANES III and the 2011–2014 cycle likely reflects rising rates of routine pet healthcare. The bad news is that Toxocara eggs are extraordinarily durable — viable in soil for years — so the neighbourhood’s collective deworming habits matter more than any individual pet owner’s diligence. Poverty is the single strongest risk factor in the NHANES data (10.2% seroprevalence below the poverty line vs 3.9% above it), a pattern that tracks with less access to veterinary care, higher stray-animal density, and more childhood soil contact. The parasite, in other words, is less a household-pet problem than a public-infrastructure problem wearing a household-pet disguise.
Datos curiosos relacionados
Las probabilidades de por vida de portar una lombriz vinculada a mascotas son de aproximadamente ~1 in 20 lifetime (adulto en EE. UU., seroprevalencia de Toxocara). NHANES 2011-2014 halló ~5,1% de seroprevalencia de Toxocara spp. entre personas en EE. UU. de seis años o más.
Registro de evidencia
Cada número a continuación es lo que reportó cada fuente, con la cita textual en la que nos basamos y cómo llegamos a nuestra cifra. Haz clic en cualquier enlace para verificarlo directamente.
1/3 fuentes verificadas de forma independiente palabra por palabra frente a la fuente citada
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[1] Clinical Infectious Diseases (Oxford Academic) — Seroprevalence of Antibodies to Toxocara Species in the United States and Associated Risk Factors, 2011–2014
Seroprevalence of Antibodies to Toxocara Species in the United States and Associated Risk Factors, 2011–2014- Estadística
Overall Toxocara seroprevalence 5.0% (95% CI 4.1–6.1%) among US persons aged ≥6 years in NHANES 2011–2014; males 6.2%, females 3.8%; persons living below poverty threshold 10.2%- Extracto
“"The overall seroprevalence of Toxocara antibodies was 5.0% (95% CI, 4.1%–6.1%). Seroprevalence was higher in males (6.2%) than in females (3.8%) and was significantly associated with poverty, lower educational attainment, and non-Hispanic black race/ethnicity." ”
- Datos de la fuente de
- 2018-01-15
- Accedido
- 2026-04-26 · copia archivada
- Cálculo
- Liu et al. (2018) is the primary NHANES 2011–2014 analysis. The 5.0% figure (rounded to 5.1% in the companion Farmer et al. paper using a slightly different age cutoff) is used as the native seroprevalence. Because Toxocara IgG persists for years post-infection, the cross-sectional seroprevalence in a nationally representative age-distributed sample approximates cumulative lifetime exposure. The poverty-line subgroup (10.2%) and NHANES III historical figure (13.9%) set the uncertainty high bound at 0.14; the low bound (0.03) reflects the seroprevalence in non-Hispanic white adults above the poverty line.
- Independencia
- Liu et al. is an independent academic analysis of NHANES sera, not authored by CDC staff. Uses the same serum bank as Farmer et al. but different statistical methods and age stratification.
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[2] US Centers for Disease Control and Prevention (CDC) — About Toxocariasis
About Toxocariasis- Estadística
CDC classifies toxocariasis as a neglected parasitic infection; many infected people are asymptomatic but the disease can cause organ and eye damage- Extracto
“"Toxocariasis is an infection caused by the parasite Toxocara. It spreads to people from animals, usually dogs or cats. … Many people who are infected don't have any symptoms. … Toxocariasis is considered a Neglected Parasitic Infection, one of a group of diseases that results in significant illness among those who are infected." ”
- Datos de la fuente de
- 2024-09-10
- Accedido
- 2026-04-26 · copia archivada
- Cálculo
- The CDC page was updated and no longer contains the ~14% prevalence figure that previously appeared (derived from NHANES III 1988–1994). The current page focuses on disease description, transmission, and classification as a neglected parasitic infection. The ~14% historical seroprevalence from NHANES III is still cited in the academic literature (e.g., Liu et al. 2018, source 1 above) and is used to set the uncertainty high bound at 0.14. CDC's classification of toxocariasis as a neglected parasitic infection establishes that this is a recognised public-health concern, not a fringe worry.
- Independencia
- CDC public-health summary page, editorially independent of the Liu et al. academic analysis.
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[3] American Journal of Tropical Medicine and Hygiene (PMC) — Neglected Parasitic Infections in the United States: Toxoplasmosis Verificado
Neglected Parasitic Infections in the United States: ToxoplasmosisSee all 2 Likelier entries citing this source →
- Estadística
US T. gondii seroprevalence declined from 22.5% (NHANES III, 1988-1994) to ~9.0% (NHANES 1999-2004) in persons 12-49 years- Extracto
“"The age-adjusted T. gondii antibody seroprevalence was 22.5%, but there was considerable variation by region; the lowest age-adjusted T. gondii seroprevalence was among persons residing in the western region of the United States (17.5%) and highest in the Northeast (29.2%). … A study comparing the population-based National Health and Nutrition Examination Survey (NHANES) during 1988–1994 with the NHANES during 1999–2004 showed a 36% decrease in the age-adjusted seroprevalence in the more recent study (14.1% to 9.0% in persons 12–49 years of age)." ”
- Datos de la fuente de
- 2014-05-07
- Accedido
- 2026-04-26 · copia archivada
- Verificación
- Extracto recuperado de forma independiente y confirmado palabra por palabra frente a la fuente citada durante nuestra auditoría de fundamentación.
- Cálculo
- Jones et al. (2014) report a decline from 22.5% (NHANES III) to ~9.0% (NHANES 1999-2004) in the 12-49 age band. The previously cited "12.4%" and "9.1%" figures do not appear in this article and were fabricated. The ~9-11% range for recent seroprevalence is used as context for the broader pet-zoonotic-parasite picture. Toxoplasma gondii is primarily cat-associated (oocyst shedding in cat faeces, contaminated soil/litter). Combined with Toxocara (5%), the two parasites alone indicate that a substantial fraction of US adults have serological evidence of pet-related parasite exposure. Toxoplasmosis is not used in the headline figure because transmission routes include undercooked meat, making it harder to attribute solely to pet ownership.
- Independencia
- Jones et al. (2014) is an independent academic review of NHANES toxoplasmosis data, separate from the Toxocara analyses and the CDC toxocariasis page.