A little note for the thread about Reaper signals and implantation, (I've been over this before, but I'll do it again because I'm awesome like that

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While Reapers are suspected of being able to hijack certain wave frequencies to influence minds, they would need a stable source to do so consistantly. Based on what is suggested in the comics, novels, and field notes from ME2 and ME3, the Reapers use nanites, (tiny machines), to implant the victims covertly. Whether or not these are the same nanites that are used to process biological beings into base fluids is unknown, but what is known is that they are capable of communicating remotely with the Reapers.
In Shepard's case, his implantation, (per the core of the canon), did not likely occur with Project Lazarus, but with Object Rho. Rho's pulses had directly resulted in the indoctrination of every other being that came in contact with it, further reinforcing this notion.
With the blast wave that struck Shepard, nanites likely imbedded themselves across Shepard's body and began to slowly construct implants in his system, (implants seen in Saren and TIM). Aside from acting as a beacon/engine to subject Shepard's body to EMF, ISF, and USF signals, the implants would likely be able to project said signals outward to affect other beings. Whether the nanites could dislodge and effect other beings is unknown.
Regardless, if Shepard is afflicted by the aforementioned, his internal structure has been altered over the space of ~9-11 months by the time of the push on Earth. He would effectly have two layers of cybernetic implants by this time, as well as potential brain damage; likely in the Pariental Lobe and closely neighboring regions.