A look at the top medical headlines for the week of July 11, 2021 including: Officials are worried we may start seeing a spike in COVID cases soon and it could become serious by fall. Then, Have you lost your sense of smell? COVID may not be to blame--it could be air pollution. Then, doctors can now use smartphone cameras to detect bacteria on the skin and in the mouth. And finally, for people suffering from hard-to-treat depression, new research suggests a non-traditional treatment method - laughing gas.