Regional disparity of HIV incidence and prevalence among men who have sex with men.

Background: HIV incidence can be estimated with cross-sectional studies using clinical, serological, and molecular data. Worldwide, HIV incidence data in only men who have sex with men (MSM) are scarce and principally focus on those with healthcare or under treatment. However, better estimates can be obtained through studies with national representativeness.

[Not Available].

Objetivo. Describir el diseño y los resultados de campo de la Encuesta Nacional de Salud y Nutrición (Ensanut) 2020 so-bre Covid-19. Material y métodos.

Strong Anisotropy in Liquid Water upon Librational Excitation Using Terahertz Laser Fields.

Tracking the excitation of water molecules in the homogeneous liquid is challenging due to the ultrafast dissipation of rotational excitation energy through the hydrogen-bonded network. Here we demonstrate strong transient anisotropy of liquid water through librational excitation using single-color pump-probe experiments at 12.3 THz.

A Fortified Food Can Be Replaced by Micronutrient Supplements for Distribution in a Mexican Social Protection Program Based on Results of a Cluster-Randomized Trial and Costing Analysis.

Background: Despite positive nutrition impacts, the prevalence of malnutrition among beneficiaries of Mexico's conditional cash transfer (CCT) program remains high. Greater nutrition impact may have been constrained by the type of nutritional supplements provided.

Objective: The objective of this study was to inform a potential modification to the supplements distributed to pregnant and lactating women and children.

The cost effectiveness of antiretroviral treatment strategies in resource-limited settings.

Background: Optimal resource allocation for antiretroviral treatment (ART) in developing countries requires assessment of different strategies for drug treatment and laboratory monitoring.

Objectives: To compare costs and outcomes for 10 000 simulated HIV-infected patients followed every 6 months for 10 years in a limited-resource setting.

Method: Five nested strategies, with and without the availability of a second-line treatment regimen, were simulated: (a) no ART (NO ART); (b) with ART but without any laboratory markers of HIV other than positive serology (ART ONLY); (c) ART plus total lymphocyte count (TLC); (d) ART plus CD4 cell counts (CD4); and (e) ART plus CD4 cell count plus viral load measurement (VL).