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:
As you know, Social Security has an earnings penalty, which governs how much money you can make while at the same time receiving benefits. Exceed an annual cap (it's currently $14,160 a year) and you'll lose part or even all of your benefit. However, the penalty applies only to people between 62 and full retirement age. If you decide to wait until 66, you should apply to Social Security three months before your birthday. You can apply online, by phone (1-800-772-1213) or by going to a local Social Security office (call ahead for an appointment).