Dear User,
Your code looks right except for you also need to account for the variables hv253a-hv253c which are specifying who sprayed the dwelling in your IRS variable. I also noticed in your code you are using the mean command and creating locals from that. You could shorten your code dramatically by using the estpost command which automatically stores results such as LB and UB from the command. Just sharing some helpful Stata tips!

svyset [pw=wt], psu(hv001) strata(hv023) singleunit(centered)
g irs=0
replace irs=1 if hv253==1 & (hv253a==1|hv253b==1|hv253c==1)

estpost svy: tab irs
ereturn list

Thanks
Cameron