Transmission and containment of the SARS-CoV-2 Delta variant of concern in Guangzhou, China: A population-based study.

Background: The first community transmission of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Delta variant of concern (VOC) in Guangzhou, China occurred between May and June 2021. Herein, we describe the epidemiological characteristics of this outbreak and evaluate the implemented containment measures against this outbreak.

Methodology/principal Findings: Guangzhou Center for Disease Control and Prevention provided the data on SARS-CoV-2 infections reported between 21 May and 24 June 2021.

Transmission risk of avian influenza virus along poultry supply chains in Guangdong, China.

Objectives: Avian influenza viruses (AIVs) poise significant risk to human health and the poultry industry. We evaluated the transmission risk along the poultry supply chain.

Methods: During October 2015 and July 2016, four rounds of cross-sectional surveys were performed to characterize AIV spread in farms, transport vehicles, slaughterhouses, wholesale and retail live poultry markets (LPMs).

Attitudinal changes toward control measures in live poultry markets among the general public and live poultry traders, Guangzhou, China, January-February, 2014.

Two sets of cross-sectional surveys were conducted among the general public and live poultry traders (LPTs) during January-February, 2014, to monitor attitudes toward human cases of avian influenza A(H7N9)-related control measures among these 2 parties in Guangzhou, China. We found generally high support for regular market rest days among the general public and LPTs, but only limited support for permanent central slaughtering of poultry. LPTs' support for relevant control measures declined after the citywide wet market closure.

[Investigation on the source of infection regarding an avian influenza (H5N1) case in Hong Kong that returning from Guangzhou].

Objective: We conducted an epidemiologic investigation to determine the source of infection on an avian influenza (H5N1) case who returned from Guangzhou, in Hong Kong.

Methods: Data related to epidemiologic investigation, medical observation on close contacts, Syndromic Surveillance on poultry salesmen, emergency monitoring, detection of the samples, source tracing on potential Avian influenza virus (H5, H7, H9) infected people, situation on environment pollution by avian influenza virus in the markets etc. were gathered.

[Epidemiological characteristic of first case of locally identified A/H1N1 secondary cases caused by imported source of infection in China].

Objective: To study the first locally identifed A/H1N1 secondary cases outbreak in China.

Methods: Interview and field investigation were integrated to describe the whole process of transmission on each case and to illustrate the relationships between the onset of the disease and the retated factors.

Results: Two contact persons appearanced fever and whose throat swabs were tested positive to H1N1 viral nucleic acid.