Tacky allergen trap and filter medium, and method for containing allergens

An airlaid unitary multistrata material, comprising:

• a woven or nonwoven multistrata substrate containing:
• a top hydrophobic stratum comprising synthetic fibers and, optionally, a binder;
• (ii) an intermediate stratum comprising cellulose fibers, synthetic fibers, and tacky adhesive, wherein the tacky adhesive is present in an amount from about 20 gsm to about 300 gsm;
• and
• (iii) a bottom stratum comprising cellulose fibers, synthetic fibers and, optionally, a binder;
• wherein the intermediate stratum is impregnated with the tacky adhesive and the tacky adhesive is coextensively contiguous with a surface of at least one stratum;
• wherein the substrate has a density of from about 0.035 g/cm3 to about 0.10 g/cm3;
• wherein the caliper of the substrate is from about 3 mm to about 60 mm,
• wherein the airflow resistance of the substrate is 500-10,000 Rayls (Ns/m3);
• and
• wherein the multistrata substrate is an airlaid material.