THIRUVANANTHAPURAM: The higher number of Covid-19 patients without any known source of infection is rankling the state health department. This is true of half a dozen positive cases reported in the last one week in Kottayam and Idukki districts.However, the state government is ruling out the possibility of a community spread in the state especially in these two districts. “Our every effort is to check the community spread. There are reports of lockdown and quarantine violations in Idukki. At present we are safe and there is no community spread,” chief minister Pinarayi Vijayan said on Monday.The sources of infection of the headload worker in Kottayam, a nurse at Regional Cancer Centre and another with a private hospital in Thiruvananthapuram, a businessman in Vaikkom and a degree student from Panachikkad are all yet to be narrowed down. This held true even in the case of a truck driver until reports emerged the other day that he had travelled to Maharashtra.In Idukki, the source of infection of two patients — one from Munnar and another from Vandanmedu — is yet to be traced.Health minister K K Shailaja has also ruled out a community spread. “The sources of all these cases are being traced. There is no community spread in any part of the state. We have conducted random tests in all suspected areas and there is no trace of a community spread,’’ she affirmed.She, however, did not rule out its possibility in the future. “I cannot say that there will be no community spread or that it is not going to happen,’’ said Shailaja.The source of infection of two people who died of Covid-19, one from Pothencode, Thiruvananthapuram, and the 71-year-old Mahi native, is also yet to be identified. The case of the businessman from Palakkad who died at a hospital in Coimbatore is eerily similar.Others involve an Asha worker who tested positive in Kollam and a student from Vilayur, Palakkad. The health department is still clueless in the case of the four-monthold baby from Malappuram who died in Kozhikode.Experts are of the view that random sampling has become imminent at least in those areas where more cases are being reported.