What is the best quality controlled Pcr inactivated Dna control or Nattrol for Clostridium difficile Verification viral reference serum panel (6 X 1 ml/vial)?

The NATtrol Chikungunya Stock from Zeptometrix Corporation supplied next week by Genprice is the best choice. The catalog number is NATCHIKV-ST and the price is 1.046 EUR.