Solomus Prime

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For months I agonized over Smokescreen and why the Matrix recognized him as Prme.

I came up with a solution. Way back when Smokescreen was an infant sparkling, he became very sick. After Elita miscarried and as recovering in the same sickbay, Optimus overheard Ratchet give the news to Smokescreens parents.

Optimus was already playing a dangerous game with Megatron. He knew he could not doom cybertron to Megatron and the Dynasty for not having a heir. He told Ratchet what he wanted done to Smokescreen, that he would be the donor. This gave Smokescreen the dynasty blood type and would ensure there was another that could become Prime should Optimus fall to Megatron.

Two years later, Altima was concieved. Optimus continued to secretly keep tabs on Smokescreen, using his connections to get Smokescreen asigned to guard Alpha Trion, who knew what Optimus had done. Smokescreen knew his life was saved by an anoymous donor.

When Optimus was dying inside the cavern, he revealed all to Smokescreen.

It is scientficaly possible gain a new blood type. It is what happens after a bone marrow transplant.

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To clarify a few things, it is possible to change your blood type through a bone marrow transplant. What needs to match is not the blood type but your HLA antigens. HLA stands for Human Lucocyte Antigen. For a transplant to be successful, at least 5 antigens must match. Some places try for an 8 to 10 antigen match.

All Transformers have antivirus systems. Unlike humans who have bone marrow found in their bones, Transformers have a single organ that produces antiviruses to combat viruses and toxins that get into the body. This organ, called the Antivirus System, is not only connected to the body's circulatory system, but has a system of veins and arteries interconected with the circulatory system that delivers antivirus where it needs to go.

Cybonic Plague is deadly because it attacks the antivirus system and strips it of its ability to produce more antivirus. It is the secondary infection that kills by overwhelming the antivirus system.

As seen in Sick, found here, When Optimus came down with Cyberflu, Ratchet revealed that the Cybonic Plague had damaged Optimus's antivirus system leaving him unable to fight off the flu. Ratchet was able to perform an antivirus transfusion using Altima as the donor.