HomeNewsWorldHong Kong expands travel curbs on Omicron fears, Australia reports 5 cases

Hong Kong expands travel curbs on Omicron fears, Australia reports 5 cases

Singapore’s health ministry said two travellers from Johannesburg who tested positive for the variant in Sydney had transited through its Changi.

November 30, 2021 / 09:21 IST
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The measures reflect a growing sense of urgency over the relentless rise in cases, which the Kremlin has blamed on low vaccination rates. (Image: Reuters)
The measures reflect a growing sense of urgency over the relentless rise in cases, which the Kremlin has blamed on low vaccination rates. (Image: Reuters)

Hong Kong expanded a ban on entry for non-residents from several countries as global health authorities raced to curb a potential outbreak of the Omicron virus, while Australia’s cabinet will review on Tuesday containment steps after five tested positive.

Singapore’s health ministry said two travellers from Johannesburg who tested positive for the variant in Sydney had transited through its Changi.

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Omicron – first reported in southern Africa and which the World Health Organization (WHO) said carries a "very high" risk of infection surges – has triggered global alarm, with border closures casting a shadow over a nascent economic recovery from a two-year pandemic.

Hong Kong is among the latest to expand travel curbs. In a late Monday statement, city authorities said non-residents from Angola, Ethiopia, Nigeria and Zambia would not be allowed to enter as of Nov. 30.

COVID-19 Vaccine
Frequently Asked Questions

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How does a vaccine work?

A vaccine works by mimicking a natural infection. A vaccine not only induces immune response to protect people from any future COVID-19 infection, but also helps quickly build herd immunity to put an end to the pandemic. Herd immunity occurs when a sufficient percentage of a population becomes immune to a disease, making the spread of disease from person to person unlikely. The good news is that SARS-CoV-2 virus has been fairly stable, which increases the viability of a vaccine.

How many types of vaccines are there?

There are broadly four types of vaccine — one, a vaccine based on the whole virus (this could be either inactivated, or an attenuated [weakened] virus vaccine); two, a non-replicating viral vector vaccine that uses a benign virus as vector that carries the antigen of SARS-CoV; three, nucleic-acid vaccines that have genetic material like DNA and RNA of antigens like spike protein given to a person, helping human cells decode genetic material and produce the vaccine; and four, protein subunit vaccine wherein the recombinant proteins of SARS-COV-2 along with an adjuvant (booster) is given as a vaccine.

What does it take to develop a vaccine of this kind?

Vaccine development is a long, complex process. Unlike drugs that are given to people with a diseased, vaccines are given to healthy people and also vulnerable sections such as children, pregnant women and the elderly. So rigorous tests are compulsory. History says that the fastest time it took to develop a vaccine is five years, but it usually takes double or sometimes triple that time.
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