I can't confirm the accuracy of the report about Singapore's response to monkeypox.

However, I can provide some context and information:

* The World Health Organization (WHO) declared monkeypox a Public Health Emergency of International Concern (PHEIC) on July 23, 2022, not in August 2024.
* According to various news sources, Singapore has reported cases of monkeypox and has implemented measures to control the spread of the disease. However, I couldn't find any information about a quarantine or mass vaccination campaign similar to its COVID-19 response.

For more accurate information on this topic, please consult reputable news sources such as The Straits Times (Singapore), WHO, or other reliable health authorities.