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Effect of Omicron on the prevalence of COVID-19 in international travelers at the Mexico city international airport. December 16th, 2021 to January 31st, 2022.
Olaiz-Fernández, Gustavo; Vicuña de Anda, Félix Jesús; Diaz-Ramirez, Jorge-Baruch; Fajardo Dolci, German E; Bautista-Carbajal, Patricia; Angel-Ambrocio, Antonio Humberto; García-León, Miguel Leonardo; Gómez Peña, Elena; Camacho Morales, Jorge Alejandro; Wong-Chew, Rosa Maria.
  • Olaiz-Fernández G; Center for Research in Policies, Population and Health, Faculty of MedicineUniversidad Nacional Autónoma de México (UNAM), Edificio CIPPS, Piso 2, Cto, Centro Cultural Universitario S/N, C.U. Coyoacán, 04510, Ciudad de México, Mexico.
  • Vicuña de Anda FJ; Center for Research in Policies, Population and Health, Faculty of MedicineUniversidad Nacional Autónoma de México (UNAM), Edificio CIPPS, Piso 2, Cto, Centro Cultural Universitario S/N, C.U. Coyoacán, 04510, Ciudad de México, Mexico.
  • Diaz-Ramirez JB; Traveler's Preventive Care Clinic, Facultad de MedicinaUNAM, Aeropuerto Internacional de la Ciudad de México "Benito Juarez", Terminal 2, Venustiano Carranza, 15626, Ciudad de México, Mexico.
  • Fajardo Dolci GE; UNAM, Cto. Escolar 411A, Copilco Universidad, Coyoacán, 04510, Ciudad de México, Mexico.
  • Bautista-Carbajal P; División de Investigación, Laboratorio de Investigación en enfermedades infecciosas, Facultad de MedicinaUNAM, Cto. Escolar S/N, Copilco el Alto, Coyoacán, 04510, Ciudad de México, Mexico.
  • Angel-Ambrocio AH; División de Investigación, Laboratorio de Investigación en enfermedades infecciosas, Facultad de MedicinaUNAM, Cto. Escolar S/N, Copilco el Alto, Coyoacán, 04510, Ciudad de México, Mexico.
  • García-León ML; División de Investigación, Laboratorio de Investigación en enfermedades infecciosas, Facultad de MedicinaUNAM, Cto. Escolar S/N, Copilco el Alto, Coyoacán, 04510, Ciudad de México, Mexico.
  • Gómez Peña E; Center for Research in Policies, Population and Health, Faculty of MedicineUniversidad Nacional Autónoma de México (UNAM), Edificio CIPPS, Piso 2, Cto, Centro Cultural Universitario S/N, C.U. Coyoacán, 04510, Ciudad de México, Mexico.
  • Camacho Morales JA; Department of Biomedical Informatics, Faculty of MedicineUNAM, Cto. Escolar S/N, Copilco el Alto, Coyoacán, 04510, Ciudad de México, Mexico.
  • Wong-Chew RM; División de Investigación, Laboratorio de Investigación en enfermedades infecciosas, Facultad de MedicinaUNAM, Cto. Escolar S/N, Copilco el Alto, Coyoacán, 04510, Ciudad de México, Mexico. Electronic address: rmwong@unam.mx.
Travel Med Infect Dis ; 49: 102361, 2022.
Article in English | MEDLINE | ID: covidwho-1867827
ABSTRACT

INTRODUCTION:

SARS-CoV-2 continues to have a high rate of contagion worldwide. The new variant of concern, Omicron, has mutations that decrease the effectiveness of vaccines and evade antibodies from previous infections resulting in a fourth wave of the pandemic. It was identified in Mexico in December 2021.

METHODS:

The Traveler's Preventive Care Clinic from the Faculty of Medicine UNAM at Mexico City International Airport has performed rapid antigen and PCR SARS CoV2 tests since January 2021 to comply with the new travel requirements. Demographic and clinical characteristics were collected from each passenger and the fourth wave of the pandemic in Mexico mainly caused by Omicron was analyzed in the travelers.

RESULTS:

A total of 5176 travelers attended the clinic between the second half of December 2021 and January 2022. Ten percent of all the tests performed were positive (13% of PCR and 9.3% of antigens, p = 0.001). Most of the SARS CoV2 positive cases were asymptomatic (78%), with a ratio of 3.51 over the symptomatic. By age groups, this ratio was higher for those under 20 years old (8.71).

DISCUSSION:

This study shows the rapid escalation of positivity that occurred in Mexico, detected in travelers, from the second half of December 2020 and throughout the month of January 2021. The incidence of COVID-19 was extremely high in travelers who were mostly asymptomatic for the period under study.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines / Variants Limits: Adult / Humans / Young adult Country/Region as subject: Mexico Language: English Journal: Travel Med Infect Dis Journal subject: Communicable Diseases Year: 2022 Document Type: Article Affiliation country: J.tmaid.2022.102361

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Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines / Variants Limits: Adult / Humans / Young adult Country/Region as subject: Mexico Language: English Journal: Travel Med Infect Dis Journal subject: Communicable Diseases Year: 2022 Document Type: Article Affiliation country: J.tmaid.2022.102361