With his experience analyzing wastewater to detect signs of public health problems, Rolf Halden (pictured), a Fulton Schools professor of environmental engineering, wasn’t surprised to see a spike in cases of COVID-19 in Arizona after the state ended the lockdown of certain types of businesses and lifted restrictions on public gatherings. Most of those measures have been reinstated as the number of cases have since risen sharply. But Halden says reducing the spread of COVID-19 infections will also require more conscientious actions by individuals to follow health guidelines to protect themselves from contracting the disease.