The party also felt ex-minister Shailaja shouldn't get sole credit for Kerala health department's commendable work during Nipah and Covid outbreaks.
Sajeesh Puthur, who was married to the late healthworker, has announced his remarriage.
Scientists at the University of Texas have developed a vaccine that could protect against the deadly Nipah virus in just three days.
It is a cause of concern that Nipah was reported in a densely populated state like Kerala on three occasions.
The minister said that Kerala has successfully completed a double incubation period of 42 days since a case emerged in Kozhikode on September 4.
The identification of the virus source appears to have given credence to the initial reports that the boy was infected after he ate Rambutan fruit bitten by bats.
The person is a native of Karwar and is working at Goa in an RT-PCR test kit manufacturing unit.
The Karnataka Government has enforced special surveillance in all districts that share a border with Kerala.
The source was yet to be identified and the government was according top priority to it, Kerala health minister Veena George said on Sunday.
In Changanassery the dead bat was found dead in an area overrun by wilderness in the fifth ward of the Municipality.