Population-Based COVID-19 Screening in Mexico: Assessment of Symptoms and Their Weighting in Predicting SARS-CoV-2 Infection.

: Sentinel surveillance in the early stage of the COVID-19 pandemic in Mexico represented a significant cost reduction and was useful in estimating the population infected with SARS-CoV-2. However, it also implied that many patients were not screened and therefore had no accurate diagnosis. In this study, we carried out a population-based SARS-CoV-2 screening in Mexico to evaluate the COVID-19-related symptoms and their weighting in predicting SARS-CoV-2 infection.

Spontaneous abortion is preceded by an altered serum concentration of matrix metalloproteinases.

To evaluate the usefulness of the serum concentration of nine matrix metalloproteinases (MMPs) as biomarkers of spontaneous abortion. A retrospective nested cohort case-control study was carried out in Zacatecas, Mexico. MMP-1-3, MMP-7-10, and MMP-12-13 were analyzed in serum from women who had spontaneous abortion of unknown causes ( = 7), who suffered abortions attributed to urinary tract infection ( = 7) and from those with healthy pregnancies without complications (controls;  = 20).