Gandhi had earlier cancelled histwo-day visit to Puducherry, Tamil Nadu and Kerala,which was to commence yesterday as he was suffering from high fever.
"Unfortunately I have been down with high fever since Sunday and the doctor has advised rest for the next two days," the 45-year-old Congress leaderhad saidon micro-blogging site Twitter on Monday night.
"My apologies to the ppl of Puducherry, Tamil Nadu & Kerala for missing this opportunity of being with them on 10th &11th May as planned.
The cancellation had come close on the heels of reported threat to his life after former Union minister V Narayanasamy received an anonymous letter written in Tamil.
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Rahul had later rescheduled his Kerala trip on May 12 and 13.
On Thursday, Gandhi was supposed to arrive at Pattambi in Palakkad district and address a public rally for Congress candidates of Thrithala, Shornur and Ottapalam, besides some other events.
On Monday, top Congress leaders had met Home Minister Rajnath Singh seeking adequate security for the party Vice President following ananonymous letter threatening to attack Rahul and Narayanasamy at an election meeting in Puducherry.
The Special Protection Group and the Intelligence Bureau were on Monday ordered by the Government to take maximum precautions for Rahul Gandhi's security in the wake of the threat letter.