 The infoveillance detects disease outbreaks quicker than traditional public health surveillance systems with the minimal cost involved, revealing the promising results for the future surveillance methodologies . Google Flu Trends Google uses the query information to detect the flu trends and it compares   the results to the countries' official surveillance data .
<meaning-changed>  The infoveillance detects disease outbreaks quicker than traditional public health surveillance systems with the minimal cost involved, revealing the promising results for the future surveillance methodologies . Google Flu Trends Google uses the query information to detect the flu trends and it compares   the results to the countries' official surveillance data .
 The infoveillance detects disease outbreaks quicker than traditional public health surveillance systems with the minimal cost involved, revealing the promising results for the future surveillance methodologies . Types of infoveillance Infoveillance methods may be either passive or active. Traditional infoveillance data like search engine queries and website navigation behavior are considered passive, as they attempt to recognize trends automatically, without action (or often even awareness) on the part of the internet users who are generating the data for analysis. Active infoveillance occurs when users choose to respond to a survey, enter symptoms into a website or app, or otherwise participate directly in surveillance efforts by contributing additional information. the results to the countries' official surveillance data .