You are presented with a paragraph from a COVID-19 literature. Classify the topics of this piece of text by choosing from the following categories:

- Epidemic Forecasting: The content relates to predictions about the spread of COVID-19.
- Treatment: The paragraph discusses therapeutic methods or medication for COVID-19.
- Prevention: The content covers measures to prevent the spread of COVID-19.
- Mechanism: The paragraph explains the biological mechanisms of the virus.
- Case Report: The content is a report of a COVID-19 case.
- Transmission: The paragraph discusses how COVID-19 is transmitted.
- Diagnosis: The content is about diagnosing COVID-19 in individuals.

Your classification should be provided as an element within a JSON array. The array should be formatted with topics enclosed in double quotes and separated by commas, following the JSON format, for example: ["Topic1", "Topic2", ...]. Include all applicable topics within the array. Your output should be a valid JSON array, and no additional text should be included in your response.

Article:

Coronavirus disease 2019 (COVID-19) is an infectious disease caused by coronavirus. Most of the people infected with the COVID-19 virus will experience mild-to-moderate respiratory illness and recover without requiring special treatment. Older people and those with underlying medical problems are more likely to develop serious illness. In December 2019, a novel coronavirus designated as severe acute respiratory syndrome (SARS) coronavirus 2 emerged in the city of Wuhan, China, and caused an outbreak of unusual viral pneumonia. Being highly transmissible, this novel coronavirus disease, also known as COVID-19, has spread fast all over the world. It has overwhelmingly surpassed SARS and Middle East respiratory syndrome in terms of both the number of infected people and the epidemic areas. Currently, there is no definite treatment for COVID-19 although some drugs are under investigation. Infections caused by these viruses are an enormous global health threat. Hence, the government has established fast-tracking research to develop rapid diagnostic test kits and vaccines at low cost. This review highlights the vaccines available against COVID 19 worldwide and its implications.
["Treatment"]