Rhoptry neck proteins (RONs) are released at the earliest points of invasion and, in collaboration with AMA1, form the circular ring of contact between the parasite and host plasma membranes known as the "moving junction" [3], [5].
Transmission takes place in two rings of contacts: 1) household and other close contacts, and 2) more casual face-to-face contacts.
The number can be computed as the sum of the reproduction numbers in the close contact and casual contact ring For the baseline parameter values given in the Table, R 0 = 5.23, which when broken down by rings of contacts gives and, i.e., 40.2% of all transmissions take place in the close contact ring.
Finally, the individual-based model by Epstein et al. [ 16] presented scenarios illustrating certain alternatives to pure mass vaccination and ring vaccination of contacts of cases in preventing smallpox transmission in small populations of 800 individuals; this model includes no homogeneity assumptions, but did not analyze tracing of contacts of contacts.
The branching process approach does not allow for overlapping rings of contact, but we implicitly include such an effect by varying the effective transmission probability such that the distribution of transmissions over the infectious period agrees with empirical findings (8 ).
Public health officials trying to plan for a potential attack aren't sure whether it would be better to vaccinate everyone and deal with side effects or to vaccinate a "ring" of close contacts of patients and exposed people and risk failing to contain an epidemic.
Other residues in the FG loop (Phe88, Pro89), Val38, and the aliphatic portion of Lys39 of the BC loop form a ring of hydrophobic contacts at the periphery of this surface pocket.
Bulky hydrophobic groups, such as the aromatic ring of thiomandelate, forming contacts with non-polar residues on the mobile β3 β4 loop and/or hydrophobic pockets at the base of the loop, are encountered in the majority of B1 subclass MBL inhibitor complexes whose structure has been determined [ 15– 17, 28] and are a common feature of an effective inhibitor.
The effectiveness of the intervention therefore is determined by the probability of diagnosis per day of the infectious period, the time needed to identify contacts of the close contact and casual contact ring, the vaccination coverage in the close contact and the casual contact ring, and whether monitoring of contacts is performed.
If consent is granted for the ring site to be included in the vaccine trial, a social mobiliser works with trial staff to define the ring, drawing up a list of all contacts and contacts of contacts in the ring, regardless of their eligibility for vaccination in the trial.
