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At the present time, do not introduce requirements of proof of vaccination or immunity for international travel as a condition of entry as there are still critical unknowns regarding the efficacy of vaccination in reducing transmission and limited availability of vaccines," the organization's statement said. brown fendi t shirt As for this year’s sponsors, some of whom spent as much as $250,000 in past years for exclusive benefits and branding opportunities, several said they were still evaluating the benefits or had decided not to sponsor at all due to mediocre returns on the investment or changes to the conference structure. brown fendi t shirt Experts who previously spoke to Fox News on the country’s lower than usual flu activity this year said that preventative measures to protect against COVID-19 — such as wearing masks, social distancing, frequent handwashing, and avoiding indoor crowds — have likely played a role in keeping the flu at bay. brown fendi t shirt Scientists may be able to predict some very obvious mutations that can pop up, such as certain amino acid changes on the spike protein that impact antibody binding or alterations in the spike's RBD  which would impact the virus's ability to stick to and enter human cells, Racaniello said. brown fendi t shirt