HOUSTON – The Harris Health System has found itself in a predicament as they expect to run out of their COVID-19 vaccine supply Friday. But, industry experts say the shortage will affect much more than Harris Health patients. Harris Health serves the uninsured and underinsured from low-income communities. For now, the final doses run out today with Harris Health unsure of when the next batch will arrive. Harris Health had been running seven vaccination sites but only ran one Friday.

As part of our Ask 2 series, the newsroom will answer your questions about all things Houston. Question: Does the COVID-19 vaccine lose its effectiveness over time and will it need to be taken annually like the flu shot? According to the Centers for Disease Control and Prevention (CDC), experts are still studying how long vaccine-induced immunity lasts. Both vaccines require recipients to receive two doses, 21 days apart, to achieve maximum effectiveness of around 95%. Send it our way, and we will try to hunt down an answer.