Travelling swiftly to the liver, the parasites hide, mature and multiply before staging a grand second act in the bloodstream, where they invade red blood cells, multiply again, and invade more cells.
This mouse species, which multiplied and invaded the niches vacated by more sensitive animals, in turn became the more common host for the ticks.
Once the virus enters our body, it multiplies in the intestines and invades the nervous system, damaging the nerves.
In the intestinal tract, an antibiotic may kill most of the microorganisms that are normally present and allow dangerous organisms, such as Pseudomonas aeruginosa, to multiply and perhaps to invade the bloodstream and the tissues of the body.
Viruses may survive for some time in the soil, in water, or in milk, but they cannot multiply unless they invade or parasitize living cells.
In absence of a specific perception by the host plant, invading microorganisms multiply and spread within the plant, leading to disease and eventually to death of the infected host.
Mastitis is an inflammatory condition of the mammary gland caused primarily by microorganisms, usually bacteria, that invade the udder, multiply and secrete toxic products that are very harmful to the host.
E. coli K1 translocates from the neonatal intestines to the bloodstream, where they multiply and cross the blood brain barrier by invading the brain microvascular endothelial cells.
Infection begins when malaria sporozoites are injected by mosquito into the host and within minutes parasites invade hepatocytes, where they multiply and differentiate into the next stage.
