The source of infection may be branches of Christmas trees, planting material and softwood, including wood waste (sawdust, chips, etc.), as well as wood packaging material.
Ang pinagmulan ng impeksiyon ay maaaring maging mga sanga ng puno ng Pasko, planting materyal at koniperong punungkahoy, kabilang kahoy basura (sup, chips, atbp), pati na rin ang kahoy packaging materyal.
Example taken from data source: CCAligned_v1 Both hardwood and softwood dusts have a total inhalable Workplace Exposure Limit (WEL) of 5mg/m3 which must not be exceeded.
Ang parehong mga hardwood at koniperong punungkahoy dusts magkaroon ng isang Workplace Exposure Limit (WEL) ng 5mg/m3 na kung saan ay hindi dapat malampasan.
Example taken from data source: CCMatrix_v1 
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