Texas Gov. Gregg Abbott said Tuesday that a “significant portion” of COVID-19 vaccines might still be sitting on hospital shelves rather than being administered to vulnerable Texans, adding that the decision to get inoculated is “always voluntary.” Abbott made the remarks in a tweet, in which he also said that stockpiles of the vaccine are being replenished regularly, noting, “we get plenty more each week.” It comes after the Texas Department of State Health Services (DSHS) said there “may be unnecessary delays” in giving all shots and in reporting administered doses to the state’s immunization registry. DSHS Commissioner John Hellerstedt said in a letter that data from the registry shows that a “significant portion” of vaccines in Texas likely haven’t been administered yet. While he acknowledged there may be valid reasons why the shots haven’t been given yet, Hellerstedt urged “all entities that have been allotted vaccine to administer their entire …