California Health and Human Services Secretary Dr. Mark Ghaly held a press conference at noon Tuesday to give an update on county reopening tiers and the COVID-19 vaccine. While cases have dropped in CA, another surge is still possible. What you need to default too are not stakeholders, but science-based experts, said Dr. Mike Wasserman, who sits on California s vaccine advisory committee. What are your thoughts about an algorithm being used to make these determinations? ABC7 s Stephanie Sierra asked. In order to have a successful algorithm you need to have science, evidence, and when you re dealing with a vulnerable population we don t have a lot of science and evidence in the midst of a global pandemic, Wasserman said. We need more transparency about how the algorithm is designed.