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INTRODUCTION: Toxoplasmosis is a zoonosis caused by Toxoplasma gondii. Evidence has been found in Mexico in cats, dogs, pigs, boars, horses, sheep, ocelots, cougars, spider, monkeys, rabbits, marine mammals and chickens. The conditions are congenital and severe neurological (encephalitis) that affect the functioning of the liver, lungs, kidneys and retina. OBJECTIVE: Not having a history of the existence of this disease in Ensenada city, Baja California (BC), the objective was to perform a frequency study of toxoplasmosis in patients attended in three clinical laboratories, to demonstrate the presence of the disease in this region. MATERIALS AND METHODS: This prospective and descriptive study was conducted in the period between June 1, 2015 and May 31, 2016. A total of 139 blood samples were collected from humans from one year to 75 years old in Ensenada city. For the diagnosis of toxoplasmosis, a commercial ELISA kit was made. RESULTS: The frequency of toxoplasmosis was 8.6% (12/139) in humans 1-75 years of age (CI: 95%, 5.0-14.4). Of the total samples, six corresponded to women and six to men, representing 4.3% in each case (CI: 95%, 1.9-9.1 for both sexes); In addition, two patients (1.4%) younger than 18 years (CI: 95%, 0.4-5.0) and 10 patients (7.1%) older than 18 years (CI: 95%, 3.9-12.7) were positive for toxoplasmosis. DISCUSSION: This study shows that although the frequency of infection by Toxoplasma gondii is low in the city of Ensenada, B.C., the risk of contracting it exists; In addition, it's found that its prevalence in humans is related to that of animals. In this study, there was no difference in the prevalence of toxoplasmosis by sex, as has happened in other parts of the world, probably because they have the same eating and working habits. Likewise, it was demonstrated that the adults sampled in Ensenada had higher prevalence (7.1%) than those under 18 years (1.4%), a situation consistent with other regions, which shows that toxoplasmosis prevalence --which is one of the main parasitic diseases in humans-- increases with age. CONCLUSIONS: With the results of this study it was confirmed that toxoplasmosis does exist in Ensenada, B.C., so it must be included in the differential diagnoses in the health sector. [ABSTRACT FROM AUTHOR]

We report a 7-year-old male patient from Veracruz with a history of bronchial hyperresponsiveness and zoonoses with cats, dogs and birds. He began his condition 10 months previous with fever, without predominance of hours, underarm lymph nodes left and right groin, with subsequent development of lymphadenopathy in the neck. Four months after the beginning of his sickness we requested serology for Toxoplasma, which was positive, and remained untreated for being an immunocompetent patient. However, follow-up visit one month after the first assessment, revealed fatigue of three weeks of evolution and loss of 450 g in weight, with no decrease in the lymph nodes. Biopsy was requested to rule out other diagnostic possibilities. Inguinal lymph node biopsy reported nonspecific follicular hyperplasia. [ABSTRACT FROM AUTHOR]