At least 68 people have fallen ill in the outbreak believed to be linked to cucumbers sold in the United States and Canada, the Centers for Disease Control and Prevention said.
The rapid advance on Aleppo came just four days after a surprise opposition offensive that represents the most intense escalation in the civil war in years.
But over the years, the former congressman's views have often aligned with those of his potential boss, Robert F. Kennedy Jr., particularly on vaccine safety.
The ceasefire agreement between Israel and Hezbollah, which came into force this week, does not say when people will be able to return to the cities and villages of Lebanon's far south.