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:
1 You must be at least 61 years and 9 months old to apply for retirement benefits. 2  If you are already age 62, you may be able to start your benefits in the month you apply.3  You should apply for benefits no more than four months before the date you want your benefits to start. If you are not getting Social Security and you are not ready to retire, you should still use our online retirement benefit application to sign up for just Medicare three months before your 65th birthday.