Swedish officials say an invasion of American lobsters could outcompete or spread disease to European lobsters.
|
|
For years, scientists have been tweaking the mosquito's genome, hoping to interfere with its ability to spread disease to people.
|
|
Moving nonnative managed colonies has proven risky, though: Nonnative species can spread disease to native ones, reducing native bee populations.
|
|
Bison management is a hot-button issue for ranchers in Wyoming and Montana who fear they can spread disease to cattle.
|
|
But those who decide not to immunize their kids can potentially spread disease to other vulnerable individuals, like sick people who can't be vaccinated because of valid medical concerns, and young babies who haven't yet gotten their shots.
|
|
The group argued that if undocumented children were kept from school, they would become delinquents swarming the streets, and if undocumented workers were kept from health care, they would spread disease to people eating at the restaurants where they worked.
|
|
Because that's what we're doing by practicing social distancing and self-isolating, or by self-quarantining if we or other people with whom we've come into contact have shown symptoms of this virus: We're making sure that we don't needlessly spread disease to vulnerable people, whether or not we know them personally.
|
|
Also, people released pet fish like guppies, suckermouth catfish, and swordtails in local bodies of water. The suckermouth catfish burrow into the ground, thus harming the local wildlife. Even seemingly harmless guppies can spread disease to native gobies.
|
|
Also of economic significance are manifestations of the species in slaughter- houses and poultry houses. Populations of P. terraenovae are maintained by refuse and the carcasses of dead animals. Due to their predacious nature, large numbers of this species can populate in the presence of other Dipteran species. Blowfly bred at these locations cause considerable local nuisance and may spread disease to both humans and animals by contaminating meat and foodstuffs.
|
|
In Florida, this species appears to have been introduced via escapes from the aquarium trade, although some deliberate releases are suspected. In some areas Blackchin tilapia can make up to 90% of the fish biomass. They can then spread disease to and out compete native fish. In Hawaii it is sometimes called the "saltwater tilapia" because it has the ability to survive and possibly even breed in pure seawater.
|
|
Only some hardier pollution-tolerant species, such as Günther's Frog and Asian Common Toad, can thrive in polluted habitats. Some exotic/market amphibian species are occasionally seen in the countryside, such as the American Bullfrog. Some are deliberately released during Buddhist ceremonies. These released animals can adversely affect the local ecosystem and native fauna, as they may prey on, compete with, or spread disease to the native amphibian fauna.
|
|
Compulsory vaccination policies have been controversial as long as they have existed, with opponents of mandatory vaccinations arguing that governments should not infringe on an individual's freedom to make medical decisions for themselves or their children, while proponents of compulsory vaccination cite the well-documented public health benefits of vaccination. Others argue that, for compulsory vaccination to effectively prevent disease, there must be not only available vaccines and a population willing to immunize, but also sufficient ability to decline vaccination on grounds of personal belief. Vaccination policy involves complicated ethical issues, as unvaccinated individuals are more likely to contract and spread disease to people with weaker immune systems, such as young children and the elderly, and to other individuals in whom the vaccine has not been effective. However, mandatory vaccination policies raise ethical issues regarding parental rights and informed consent.
|
|