Several human diseases caused by protozoa are transmitted by a variety of arthropod vectors (Table). The vectors are not simply 'flying syringes', but represent a second host for the protozoan parasite.arasites which reside within the blood or internal organs of the host have logistical problems in terms of infecting a new host. In contrast to fecal-oral transmission, where infective stages are excreted into the environment, potential new hosts would not normally come into contact with the parasite.
If you have accumulated enough work credits (typically 40) the earliest you can collect Social Security retirement benefits is 62. At that age, your monthly payment would be about 75% of the amount you would receive by waiting to retire at SSA's full retirement age. Full retirement age:
The youngest age you can start taking Social Security benefits is 62, but that's considered early. So your check will be reduced based on how many months away from full retirement you are. Full retirement is the age when you qualify for unreduced Social Security benefits. If you were born after 1960, that's age 67. If you delay benefits until age 70, you may be eligible to receive a credit of up to 8 percent per year, depending on your birth year.