Girl in loose sportswear, while stretching on the grass in the middle of nature, with bushes and trees, on a sunny day.

Woman with a face mask walking slowly, chatting on her cell phone, with some trees and the many windows of a large building in the background.

A man and a woman talking on the street surrounded by trees, both wear masks, while she makes explanatory gestures with her hands.

Woman with a mask dressed in white in the foreground, turns and looks directly at the camera, with some trees in the background.

Young woman dressed in white and wearing a face mask, while texting on her smart phone, on the street, with trees and houses in the background.

Couple with masks, walking slowly in nature surrounded by trees, while talking and looking at each other.

Young businessman dressed formally in a suit and tie, wearing masks, while talking on the phone, outdoors with trees in the background.

Young woman putting a face mask on the street, with trees and buildings behind her, as she straightens her hair, the shot spins around her.

Pair of office workers with face masks; She helps him put his tie on, during a cloudy afternoon, with a few buildings in the background.

Texture of contaminated liquid or infected with gas bubbles in orange tones.

Nitrogen bonds moving under liquid with many bubbles emerging.

A virus in red tones moving slowly in the bloodstream.