"It is very likely that many parts of the tropical world have already seen Zika virus in the past and there will probably be considerable herd immunity in the human population," he said.
Incidentally, the antigens isolated from in vitro cultures have failed to generate considerable protective immunity, corroborating to the above mentioned hypothesis [6], [7].
In recent years, re-analysis of data from clinical trials demonstrated that both vaccines confer considerable herd immunity and interest in their use has increased.
108, 109 However, even in pregnant African women who have acquired considerable antimalarial immunity, there was high var2csa expression from parasites recovered from placenta, but mixed var2csa and A, B, C var expression from parasites circulating in the blood.
In our previous study, oral vaccination with Ts87 DNA delivered by S. typhimurium induced significant intestinal IgA secretion and considerable protective immunity against the challenge of T. spiralis infective larva [ 11].
In areas of stable transmission where adult women have considerable acquired immunity, Plasmodium falciparum infection during pregnancy typically does not cause symptomatic malaria but may lead to maternal anemia and placental malaria, especially among women having their first and second children.
However, English populations in 1918 (Table 1) apparently had considerable prior immunity, so that the effective R at the start of the first wave, calculated as Z.R 0, was much less (credibility interval 1.16-2.94 for urban populations & 1.43-5.36 for the "school" populations).
Their surrender came after President Bush failed to budge Tom DeLay, the House majority leader, who insisted on granting legal immunity to producers of a gasoline additive blamed for water pollution, a provision that sparked considerable resistance.
Although TLR3, 5, 7, 8, and 9 may achieve antitumor effects by converting immune tolerance into antitumor immunity, considerable discrepancies have been reported.
All immunological data indicate that oral immunization with the LTB strain with a prime-boost strategy can effectively enhance and extend considerable levels of acquired immunity, including the mucosal immune responses.
