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:

World health care systems are affected by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic and its associated disease, coronavirus disease 2019 (COVID-19). This new human pathogen mostly affects the respiratory system, but various extrapulmonary pathologies have been reported in the literature. It seems that the gastrointestinal system is one of the target organs for SARS-CoV- 2. Diarrhea as a long-term bowel symptom is not rare, although its occurrence is not as high as that of fever and cough.
["Case Report"]