From the network point of view, we speculate that different infectious diseases might have very similar infection networks if they share the same mode of transmission. In particular, we believe that severe respiratory infections such as H1N1 and SARS share an infection network similar to that of the less severe common cold. Hence, infection network inferred from the latter can be useful in controlling rare outbreaks of the former. Estimating the infection network from common infections has the advantage of a large volume of daily incidences. As we will show in the Results section, the volume of incidences data gathered is critical in getting accurate estimation of the network.