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The transmission of COVID-19 is the passing of coronavirus disease 2019 from person to person. COVID-19 is mainly transmitted when people breathe in air contaminated by droplets/aerosols and small airborne particles containing the virus. Infected people exhale those particles as they breathe, talk, cough, sneeze, or sing.
Michael Ryan, WHO Executive Director, highlighted that Central and South America were now 'intense zones' for COVID-19 transmission. [97] On 3 June, on World Bicycle Day, the WHO highlighted the potential for bicycles to transform the way the world moves around and create a healthier, more sustainable future after the pandemic. [98]
Transmission and life-cycle of SARS-CoV-2 causing COVID-19. Coronaviruses vary significantly in risk factor. Some can kill more than 30% of those infected, such as MERS-CoV, and some are relatively harmless, such as the common cold. [49] Coronaviruses can cause colds with major symptoms, such as fever, and a sore throat from swollen adenoids. [91]
The U.S. Centers for Disease Control and Prevention (CDC) on Monday sowed confusion over its stance on the airborne transmission of the coronavirus.
SARS-CoV-2 is the seventh known coronavirus to infect people, after 229E, NL63, OC43, HKU1, MERS-CoV, and the original SARS-CoV. [105] Like the SARS-related coronavirus implicated in the 2003 SARS outbreak, SARS‑CoV‑2 is a member of the subgenus Sarbecovirus (beta-CoV lineage B). [106] [107] Coronaviruses undergo frequent recombination. [108]
The zero-COVID strategy involves using public health measures such as contact tracing, mass testing, border quarantine, lockdowns, and mitigation software to stop community transmission of COVID-19 as soon as it is detected, with the goal of getting the area back to zero detected infections and resuming normal economic and social activities.
SARS-CoV-2, the causative agent of COVID-19, was first introduced to humans through zoonosis (transmission of a pathogen to a human from an animal), and a zoonotic spillover event is the origin of SARS-CoV-2 that is considered most plausible by the scientific community.
On 10 April 2020, Apple and Google, which account for most of the world's mobile operating systems, announced COVID-19 apps for iOS and Android. [47] Relying on Bluetooth Low Energy (BLE) wireless radio signals for proximity information, [48] the new tools would warn people that they had been in contact with who are infected by SARS-CoV-2. [47 ...