1. ALLERGEN AND PARASITE IMAGES

2. Scanning electron micrograph of a grain of marigold pollen. Credit: Annie Cavanagh/Welllcome Images CC BY NC ND Marigold pollen

3. Scanning electron micrograph of a single pollen grain from the common morning glory (Ipomoea purpurea), still sitting on the anther. This is used as a traditional Chinese medicine. Some varieties have hallucinogenic properties similar to LSD. Magnification 600x. Credit: Stefan Eberhard/Wellcome Images BIGPICTUREEDUCATION.COM Morning glory pollen grain

4. Two grains of pollen from a lissianthus plant. Credit: Annie Cavanagh/Wellcome ImagesAnnie Cavanagh BIGPICTUREEDUCATION.COM Lissianthus pollen

5. Penicillium mould Scanning electron micrograph of Penicillium mould producing chains of spores. Credit: David Gregory & Debbie Marshall/Wellcome Images BIGPICTUREEDUCATION.COM

6. Asbestos fibres (silicate minerals) in human lung tissue. Inhalation of and prolonged exposure to asbestos fibres can cause lung disease including mesothelioma (a type of cancer), pleural plaque and pleural effusion. Credit: Spike Walker/Wellcome Images BIGPICTUREEDUCATION.COM Asbestos fibres in a human lung

7. Dust mite Scanning electron micrograph of a dust mite on a dust particle. Dust mites feed on non-living organic material such as flakes of shed human skin. Dust mites are a common cause of asthma and allergic symptoms worldwide. Credit: Annie Cavanagh/Wellcome ImagesAnnie Cavanagh BIGPICTUREEDUCATION.COM

8. Nematode parasite A high-resolution image of the human helminth parasite Trichinella spiralis. Trichinella are the smallest nematode parasite of humans. Humans can be infected with the parasite by eating infected meat, such as pork. Credit: David Linstead/Wellcome Images BIGPICTUREEDUCATION.COM

9. Threadworms in the villi of the gut Threadworms (green), also known as Enterobius vermicularis, are tiny parasitic worms that hatch eggs and infect the large intestines of humans. Two villi (finger-like projections) in the gut are shown here (brown). Threadworms are the most common type of worm infection in the UK, and are particularly common in young children. Up to 40 per cent of under-tens are infected with threadworms at any one time. Credit: Annie Cavanagh/Wellcome ImagesAnnie Cavanagh BIGPICTUREEDUCATION.COM

10. Malaria-causing parasites Blood smear showing the presence of Plasmodium falciparum parasites, which cause malaria, in red blood cells. Credit: Spike Walker/Wellcome Images BIGPICTUREEDUCATION.COM

11. Scanning electron micrograph of a mosquito (Anopheles stephensi), showing the wing, proboscis, antennae, abdomen and legs. Anopheles stephensi is one of the major vectors of urban malaria in India and some parts of Asia. It is commonly used in research as it can be easily reared and maintained in the laboratory. Credit: Lauren Holden/Wellcome Images BIGPICTUREEDUCATION.COM Mosquito

12. Reusing our images Images and illustrations All images, unless otherwise indicated, are from Wellcome Images. Contemporary images are free to use for educational purposes (they have a Creative Commons Attribution, Non-commercial, No derivatives licence). Please make sure you credit them as we have done on the site; the format is ‘Creator’s name, Wellcome Images’.Creative Commons Attribution, Non-commercial, No derivatives licence Historical images have a Creative Commons Attribution 4.0 licence: they’re free to use in any way as long as they’re credited to ‘Wellcome Library, London’.Creative Commons Attribution 4.0 licence Flickr images that we have used have a Creative Commons Attribution 4.0 licence, meaning we – and you – are free to use in any way as long as the original owner is credited.Creative Commons Attribution 4.0 licence Cartoon illustrations are © Glen McBeth. We commission Glen to produce these illustrations for ‘Big Picture’. He is happy for teachers and students to use his illustrations in a classroom setting, but for other uses, permission must be sought. We source other images from photo libraries such as Science Photo Library, Corbis and iStock and will acknowledge in an image’s credit if this is the case. We do not hold the rights to these images, so if you would like to reproduce them, you will need to contact the photo library directly. If you’re unsure about whether you can use or republish a piece of content, just get in touch with us at bigpicture@wellcome.ac.uk.bigpicture@wellcome.ac.uk