The symptoms of COVID-19 can vary widely, but the most common symptoms include:


Fever or chills

Cough

Shortness of breath or difficulty breathing

Fatigue

Muscle or body aches

Headache

New loss of taste or smell

Sore throat

Congestion or runny nose

Nausea or vomiting

Diarrhea

It's important to note that some people with COVID-19 may not experience any symptoms at all, or may only have mild symptoms. Additionally, some people may experience atypical or unusual symptoms, such as skin rashes, blood clots, or neurological symptoms such as confusion or loss of consciousness.


In some cases, new symptoms have been reported in people with COVID-19, such as, hair loss, chest pain, heart inflammation, fatigue, brain fog, depression, and anxiety. These symptoms are still being studied and more research is needed to understand their frequency and cause.


It's important to note that the above information is not exhaustive, and other symptoms may occur. If you are experiencing severe or worsening symptoms, seek medical attention immediately.



 there are several known variants of SARS-CoV-2, the virus that causes COVID-19. Some of the most well-known variants include:


  • Alpha: B.1.1.7 first identified in the UK,
  • Beta: B.1.351 first identified in South Africa,
  • Gamma: P.1 first identified in Brazil,
  • Delta: B.1.617.2 first identified in India
  • Epsilon: B.1.1.28 first identified in Nigeria
  • Zeta : B.1.1.29 first identified in Brazil
  • Eta: B.1.351.21 first identified in South Africa
  • Theta: B.1.1.33 first identified in the UK
  • Iota: B.1.1.34 first identified in South Africa
  • Kappa: B.1.1.35 first identified in the UK

It's important to note that new variants are constantly being identified and studied, and their characteristics may change over time. Genetic surveillance is ongoing to understand the characteristics of these and any future variants, and how they may impact the effectiveness of current vaccines.


several COVID-19 vaccines have been authorized for emergency use or full approval in various countries around the world. Some of the most widely used COVID-19 vaccines include:


Pfizer-BioNTech: This vaccine uses messenger RNA (mRNA) technology and requires two doses given a few weeks apart.


Moderna: This vaccine also uses mRNA technology and requires two doses given a few weeks apart.


AstraZeneca: This vaccine uses a viral vector technology and requires two doses given a few weeks apart.


Johnson & Johnson: This vaccine uses a viral vector technology and requires one dose.


Novavax: This vaccine uses protein subunit technology and requires two doses given a few weeks apart.


Sinovac: This vaccine uses inactivated virus technology and requires two doses given a few weeks apart.


Sinopharm: This vaccine uses inactivated virus technology and requires two doses given a few weeks apart.


Bharat Biotech: This vaccine uses inactivated virus technology and requires two doses given a few weeks apart.


These vaccines have been authorized for emergency use or full approval in many countries around the world, but the specific vaccines that are authorized and the specific guidelines for their use can vary by country. Additionally, some countries are also developing their own COVID-19 vaccines such as Russia and China.