In November, the WHO indicated 65 of its staffers had tested positive for COVID-19 at the time, confirming information in an internal e-mail.
HO director-general Tedros Adhanom Ghebreyesus called the massive disparity in vaccination rates between rich and poor countries a "solvable problem".
The new 'variant of interest' is being closely monitored, the UN health agency said.
Several countries including the United States, Israel, as well as others in Europe, the Middle East and Asia, are already offering or planning to offer their populations COVID-19 booster shots.
Indian researchers have yet to share any advanced research about the vaccine, which has been authorised and used in India.
Rotavac 5D's formulation allows it to be administered without a buffer and its low dose volume facilitates vaccine logistics, cold chain management and low biomedical waste disposal post-vaccination.
The key difference between the two is that the transmission (from one human to another) in Covid is via air, breath and hand contact, which is much easier and common than body fluid transmission.
Rolling data allows the WHO to start its review right away, as information continues to come in, to accelerate the overall review process.
Meanwhile, WHO chief Tedros also said, the virus is continuing to evolve, resulting in more transmissible variants.
Many, including the World Health Organization, have been critical of the vaccine inequalities in the world as the vast majority of people in lower-income countries are still waiting on a first dose.
WHO's expert group said the U.N. agency should develop ways to identify any potentially concerning gene editing trials and a mechanism "for reporting violations of research integrities".
The research found that catching COVID-19 increases the likelihood of serious illness in the most vulnerable young people, those with pre-existing medical conditions and severe disabilities.
Numerous experts, some with strong ties to WHO, say that political tensions between the U.S. and China make it impossible for an investigation by the agency to find credible answers.
The WHO said in a monitoring report Tuesday that North Korea's testing figures included 733 people who were tested during June 4-10.
National COVID-19 task force spokesman Wiku Adisasmito said the slow progress can be put down to limited global vaccine supply, the unpreparedness of the national health system and vaccine hesitancy.