Vásquez Tsuji O, Ruiz Hernández A, Martínez Barbabosa I, Merlín Marín P N, Tay Zavala J, Pérez Torres A
Unidad de Investigación Clínica y Biomédica, Hospital Pediátrico de Iztacalco, Dirección General de Servicios de Salud del Departamento del Distrito Federal, México, D.F.
Bol Chil Parasitol. 1996 Jul-Dec;51(3-4):54-8.
Due to de high number of stray dogs and cats which defecate in public places in Mexico City (3 millions approximately), in addition to domestic dogs and cats, exists the potential risk to man of infection by Toxocara sp. eggs. A study to determine the contamination frequency by Toxocara sp. eggs in public parks, public flower beds, and home gardens in Mexico City, Distrito Federal, was carried out in the 1995 first semester. Fourteen hundred and five soil samples were collected from 156 public parks, 83 public flower beds and 42 home gardens across the 16 delegations in Mexico City, Distrito Federal. Samples were processed by the zinc sulfate centrifugal flotation method, and supernatants read by microscopy. Out of the whole 281 sampled sites, 12.5% were found contaminated with Toxocara sp. eggs. Positivity found was: 10.9% in public parks, 13.3% in public flower beds and 16.7% in home gardens. Ninety percent of the eggs were embryonated or larvaeted measuring 60 to 90 micrometers. The high contamination frequencies found make necessary to prompt for Public Health measures granted the risk of infection acquisition spread on the most exposed population (children) provided that it is acquired via geophagia.
由于墨西哥城（约300万）有大量流浪狗和猫在公共场所排便，再加上家养的狗和猫，人类存在被弓蛔虫属虫卵感染的潜在风险。1995年上半年，在墨西哥城联邦区开展了一项研究，以确定公园、公共花坛和家庭花园中弓蛔虫属虫卵的污染频率。从墨西哥城联邦区16个行政区的156个公园、83个公共花坛和42个家庭花园中采集了1405份土壤样本。样本采用硫酸锌离心浮选法处理，上清液通过显微镜观察。在全部281个采样点中，发现12.5%被弓蛔虫属虫卵污染。发现的阳性率为：公园中为10.9%，公共花坛中为13.3%，家庭花园中为16.7%。90%的虫卵已胚胎化或含有幼虫，大小为60至90微米。鉴于最易暴露人群（儿童）通过食土癖有感染风险，发现的高污染频率使得有必要迅速采取公共卫生措施。
