People who do not have symptoms can still spread the Hepatitis A virus. Symptoms of hepatitis A usually develop between 2 and 7 weeks after infection. Other media organizations in Beijing also have experienced increased instances of cyberattacks and more sophisticated attacks, according to journalists in China who spoke on condition of anonymity for fear of reprisal. Later Thursday, the Wall Street Journal said its computer systems had been infiltrated by Chinese hackers apparently seeking to monitor the paper’s China coverage, calling it an “ongoing issue.”.