<![CDATA[Corona virus has become a global threat at the end of 2019. The spread of this corona virus is very fast to all countries in the world. The World Health Organization (WHO) has determined the status of the corona virus as a global pandemic called the Corona Virus Desease 2019 (Covid-19). Indonesia was detected first case of Covid-19 on March 2, 2020. After that, the number of Covid-19 cases in Indonesia increased every day and had a real impact on various sectors sectors, such as the economic and education. The Indonesian government has handled this health disaster, one of way that has been done is by holding a COVID-19 vaccine. Includes one dose vaccine, second dose vaccine and vaccine booster. The existence of this vaccine booster has received various opinions from Indonesian netizens who were conveyed through social media of Twitter. Therefore, this research aims to analyze the sentiments of Indonesian netizens about booster vaccination. In this study, data was collected from the Twitter dataset by crawling using the Rapidminer. Then, the data preprocessing stage is carried out consisting of: case folding, tokenizing, filtering and stemming. Sentiment classification is divided into positive sentiment, negative sentiment and neutral sentiment. Sentiment classification resolved using the Naive Bayes algorithm. This research resulted sentiment of vaccine booster during Covid-19 based on Indonesian netizen, include tweets of 23% positive sentiment, tweets of 15% neutral sentiment and tweets of 76% negative sentiment with an accuracy rate of 89%.]]>
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