Lyme disease tick, illustration. Ticks (superfamily Ixodoidea) are external parasites that feed on human and animal blood. Their bite can transmit a number of diseases including Lyme disease, which is caused by the bacterium Borrelia burgdorferi.

Lyme disease bacteria. Computer illustration of Borrelia burgdorferi bacteria, the cause of Lyme disease in humans. These spiral-shaped spirochaete bacteria are passed on to humans by tick bites, commonly Ixodes ricinus in Europe and Ixodes pacificus...

Lyme disease bacteria. Computer illustration of Borrelia burgdorferi bacteria, the cause of Lyme disease in humans. These spiral-shaped spirochaete bacteria are passed on to humans by tick bites, commonly Ixodes ricinus in Europe and Ixodes pacificus...

Lyme disease tick. Computer illustration of a female Ixodes ricinus tick, a blood-sucking parasite of humans and the principal vector of Lyme disease in Europe. This tick uses specialised mouthparts to pierce the host's skin and hold fast for several...

Lyme disease bacteria. Computer illustration of Borrelia burgdorferi bacteria, the cause of Lyme disease in humans. These spiral-shaped spirochaete bacteria are passed on to humans by tick bites, commonly Ixodes ricinus in Europe and Ixodes pacificus...

Tick-bourne encephalitis, computer illustration. Tick- borne encephalitis (inflammation of the brain) covers a range of illnesses ranging from a severe paralytic encephalitis, which occurs in Siberia and is transmitted by Ixodes persulcatus, to a less...

Tick-bourne encephalitis, computer illustration. Tick- borne encephalitis (inflammation of the brain) covers a range of illnesses ranging from a severe paralytic encephalitis, which occurs in Siberia and is transmitted by Ixodes persulcatus, to a less...

Tick-bourne encephalitis, computer illustration. Tick- borne encephalitis (inflammation of the brain) covers a range of illnesses ranging from a severe paralytic encephalitis, which occurs in Siberia and is transmitted by Ixodes persulcatus, to a less...

Tick-bourne encephalitis, computer illustration. Tick- borne encephalitis (inflammation of the brain) covers a range of illnesses ranging from a severe paralytic encephalitis, which occurs in Siberia and is transmitted by Ixodes persulcatus, to a less...

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Tick, illustration

Enlarged view of a deer tick (Ixodes dammini). This tick normally feeds on mice and deer but also transmits Lyme disease to humans.

Image showing child with spreading annular- shaped lesion typical of Lyme disease; insert shows tick whose bite can result in this disease; structure in box shows actual size of tick.

Hydroxychloroquine malaria drug molecule

Doxycycline antibiotic molecule

Hydroxychloroquine malaria drug molecule

Microscopic view of a group of Borrelia burgdorferi.

Lyme disease tick, illustration